However, if a physical mechanism or a model could be included in the optimization method, the effects could be possibly predicted. A genetic algorithm based on the artificial neural network was used as the optimization method. The research object of the report is an axial flow dualstage counterrotating compressor. In this paper, non axisymmetric endwall contouring optimizations in a high pressure turbine second vane passage were performed with and without including the rim seal flow. Effects of nonaxisymmetric endwall contouring and film. The endwall was designed by an endwall design optimization platform at 0o incidence design condition. This profile has been manufactured and fitted to the durham linear cascade. The current paper presents experimental and computational results to assess the effectiveness of non axisymmetric endwall contouring in a compressor linear cascade. A simplified model and a 6equation system for the physical connection between the endwall geometry and secondary. Turbine blade row optimization through endwall contouring by. Offaxis conic surfaces for nonaxisymmetric surface generation.
Rose, nonaxisymmetric endwall profiling in the hp ngvs of an axial flow gas turbine, in asme 1994 international gas turbine and aeroengine congress and exposition pp. However, limited work has been reported on using non axisymmetric endwalls at the stator casing and on its interaction with the tip leakage flow. Axisymmetric analysis a problem in which the geometry, loadings, boundary conditions and materials are symmetric with respect to an axis is one that can be solved as an axisymmetric problem instead of as a three dimensional problem. Secondary flow and endwall optimization of a transonic turbine. The sinusoidal profiling is carried out with constant profile curvature along the mean streamline path. Asme 1994 international gas turbine and aeroengine congress and exposition, hague, netherlands, 1994. The required endwall shape is nonaxisymmetric and is generated parametrically by. Please see attached for the details of the geometry and the mesh. Fem 2d bar elements and axisymmetric file exchange. Numerical investigation and nonaxisymmetric endwall. Application to circular reservoirs cristiano yudok chung rodrigues abstract the present paper addresses the linear analysis of axially symmetric structures of thin shell subjected to axisymmetric loads.
Pdf a design method for profiling the end wall to reduce secondary flow has been reported. Croonquist jet propulsion laboratory california institutu of technology 4b30 oak grove drive pasadena, california 91109 abstract the non axisymmetric shapes of a rotating drop in an immiscible system have been studied. Nonaxisymmetric endwall profiling in the hp ngvs of an. Frank gersbach product manager additive manufacturing. Nonaxisymmetric endwall profiling of a stator row in the. Axisymmetric definition and meaning collins english dictionary. Computational investigation of secondary flow losses in. Author concluded that there was a little impact of punch geometry on the maximum load, for the same logarithmic deformation. The required endwall shape is nonaxisymmetric and is generated parametrically by altering a calculation grid for an existing ngv. In this paper, we present the computed flow results for those endwall designs produced using the automated nonaxisymmetric endwall design procedure and target objective functions detailed in part 1 of this paper, and where available, compare these with experimental measurements made using the csir lowspeed research turbine used as the test case for the designs.
The design objective was to minimize the total pressure losses. Simply select your manager software from the list below and click on download. Effect of camber on nonaxisymmetric endwall contouring. Nonaxisymmetric shapes of a rotating drop in an immiscble system t. Pdf nonaxisymmetric endwall profiling in a turbine. Most of the situations the loading that comes on the structures are also symmetric. As a passive flow control approach, nonaxisymmetric endwall profiling can effectively suppress the secondary flow and flow separation, in which concaveconvexity profiling is applied on the endwall to reduce the lateral pressure difference. Cfd investigation on the application of optimum non axisymmetric endwall profiling for a vaned diffuse pages. The detailed solution flow, temperature distribution and carbon concentration distribution were calculated by 3dimensional numerical analysis. Non axisymmetric shapes of a rotating drop in an immiscble system t. Optimization and knowledge discovery of a threedimensional parameterized vane with nonaxisymmetric endwall. Anisotrpic tetrahdera is genrated only on the outer. Rose proceedings of the institution of mechanical engineers, part a.
Numerical simulations were conducted by commercial software numeca. The durham university cascade 10 is another example of a cascade in this general class, and has been used variously to investigate the effect of skewed inlet flow, upstream slot injection, and, more recently, nonaxisymmetric endwall profiling on the cascade losses. Investigation of nonaxisymmetric endwall contouring in a. Nonaxisymmetric shroud profiled endwall optimization of. Dragy drag reduction via turbulent boundary layer flow control. Optimization of the nonaxisymmetric stator casing of a 1. The nonaxisymmetric endwall profiling has been proven to be an effective tool to reduce the secondary flow loss in turbomachinery. Designers have successfully used nonaxisymmetric endwall contouring.
In this paper, the focus lies on intermediate sshaped duct endwall profiling and its influence. The current paper presents experimental and computational results to assess the effectiveness of nonaxisymmetric endwall contouring in a compressor linear cascade. Design of nonaxisymmetric endwall profiling of the endwall is done in such a way to have convex curvature in the pressure side and concave curvature causes the cross passage pressure gradient that drives secondary flow, so that mirroring the blade curvature on the endwall should assist in eliminating this effect. Axisymmetric solid with nonaxisymmetric load using matlab. The variation between the optimum slope and the original parent slope for the keck segments are within a few seconds of the arc. A novel surface definition is used to design the nonaxisymmetric stator casing of a 1.
Research on effects of incidence to turbine guide cascade. Previous studies show that nonaxisymmetric endwall could be used to. Development of an automated nonaxisymmetric endwall contour. Nonaxisymmetric endwall profiling in a turbine rotor blade. Nonaxisymmetric endwall contouring is a mechanism which attempts to reduce the negative effects of secondary flows in compressor and turbine blade rows by allowing the otherwise cylindrical turbine endwalls to take on threedimensional and therefore nonaxisymmetric curvature in an attempt to favourably manipulate the endwall pressure fields which drive these flows.
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Nonaxisymmetric endwall contouring is a wellknown but somewhat controversial technique which was developed originally for the reduction of the losses associated with turbine disc leakage flows 3. Optimization and knowledge discovery of a threedimensional. Fem 2d bar elements and axisymmetric file exchange matlab. On an interpolation based spectral homotopy analysis method for pde based unsteady boundary layer flows. Non axisymmetric endwall contouring is a wellknown but somewhat controversial technique which was developed originally for the reduction of the losses associated with turbine disc leakage flows 3. Axisymmetric definition of axisymmetric by the free dictionary. The timeresolved flowfield is measured in the passage of a linear turbine cascade to show the effects of endwall film cooling and nonaxisymmetric endwall contouring on the passage secondary flows. Nonaxisymmetric endwall profiling in a turbine nozzle blade cascade. Here, we report on the application of nonaxisymmetric endwall. Nonaxisymmetric endwalls in turbine stages have shown to be a robust method to improve the performance of turbines in both power generation and aeroderivative applications.
The calculated results indicated that the profiled endwall minimized the lateral movement of weaker boundary layer fluid from the hub pressure surface corner. In this work we want to study axisymmetric and nonaxisymmetric structures, evocated by the magnetorotational instability in the outer regions of protoplanetary disks. Design of non axisymmetric endwall profiling of the endwall is done in such a way to have convex curvature in the pressure side and concave curvature causes the cross passage pressure gradient that drives secondary flow, so that mirroring the blade curvature on the endwall should assist in eliminating this effect. National basic research program of china 2012cb720201 and beijing. Figure 7, calculation grid for the moore elliptic flow program. In this paper, nonaxisymmetric endwall contouring optimizations in a high pressure turbine second vane passage were performed with and without including the rim seal flow. Axisymmetric analysis a problem in which the geometry, loadings, boundary conditions and materials are symmetric with respect to an axis is one that can be solved as an axisymmetric problem instead of as a three dimensional problem to illustrate this type of analysis consider the problem of finding the stresses in a thick openended cylinder with an internal pressure such as a pipe. Axisymmetric solid with nonaxisymmetric load using matlab jaya lekshmi r, sanju mary sobichen, m. Dust grains with sizes around submm are expected to couple only weakly to the gas motion in regions beyond 10 au of circumstellar disks.
Perspectives on the treatment of secondary flows in axial turbines. This estimate is likely to reduce the non axisymmetric tool motion near the center point but cannot optimize the non axisymmetric motion at any radial distance away from that point. The optimization method is based on a genetic algorithm. I am doing axisymmetric analysis considering non axisymmetric loading. American society of mechanical engineers, jun 1994. K sundaresan, r marimuthu abstractin general rocket structural configurations are symmetric with respect to axis.
Nonaxisymmetric endwall profiling in the hp ngvs of. The flow simulation in the turbine was conducted by using steady rans. A particle image velocimetry system is used in three measurement planes. A nonaxisymmetric endwall profile has been designed using cfd with the aim of reducing endwall pressure nonuniformities downstream of a rotor blade. The application of 3d blading and nonaxisymmetric hub. Identify axisymmetric and nonaxisymmetric sections of the model 2. Advantages, limitations and error estimation of mixed. Non axisymmetric endwall used in compressors is not as effective as in the turbines, which owing to the circumferential pressure gradient between the ps pressure side and ss suction side of the blade passage in the compressor is lower than that in. Rosenonaxisymmetric endwall profiling in the hp ngvs of an axial flow gas turbine.
Cfd investigation on the application of optimum nonaxisymmetric endwall profiling for a vaned diffuse pages. Nonaxisymmetric endwall contouring techniques have been widely applied in gas turbines. This study investigates the control mechanism of non axisymmetric endwall on the flow field of a highly loaded compressor cascade and the guidelines for the design of non axisymmetric endwall. Add a small part of the axisymmetric section in the 3d model to have sufficient margin for the transition to take place 3. Nonaxisymmetric shapes of a rotating drop in an immisc. On and offdesign performance of a model rotating turbine. Recent observations by the atacama large millimetersubmillimeter array alma of disks around young stars revealed distinct asymmetries in the dust continuum emission. Flow through turbine stages is threedimensional and highly complex due to secondary flows, axial and tip clearances, 3d blades, rotational effects, varying fluid properties, turbulence effects, boundary layer development, etc. The perturbation law of nonaxisymmetric endwall was based on bezier curves, and the commercially available optimization software numeca finedesign 3d was used to design the nonaxisymmetric endwall.
Very few studies of nonaxisymmetric endwall profiling in compressor have been conducted in published literatures. Nonaxisymmetric endwall profiling in a highly loaded. Is there any way to get symmetric and anti symmetric part of the displacement. The results show a reduction of the static pressure nonuniformities by 70%. Non axisymmetric endwall contouring, which was introduced for the first time by rose in 1994, 5 has been widely used in turbines to reduce endwall secondary flows. The aim of the study is to depress the tip separation of s3 by endwall profiling. The design builds on previous work on nonaxisymmetric profiled endwalls by combining them with threedimensional blade design.
Aerodynamic performances of two contoured endwalls were studied and compared with the planar endwall case. In other words, analytical and experimental work focused on profile losses alone is. Profiled endwalls have been shown to effectively reduce secondary flow but have often been used as a retrofit application where the blade design is left unchanged. Nonaxisymmetric shapes of a rotating drop in an immiscble. Very few studies of non axisymmetric endwall profiling in compressor have been conducted in published literatures. American society of mechanical engineers digital collection. Nonaxisymmetric endwall profiling in a highly loaded compressor. I am meshing a turbomachinery blade passage with pointwise trex. The student community is a public forum for authorized ansys academic product users to share ideas and ask questions. Croonquist jet propulsion laboratory california institutu of technology 4b30 oak grove drive pasadena, california 91109 abstract the nonaxisymmetric shapes of a rotating drop in an immiscible system have been studied.
Nonaxisymmetric endwall profiling of a stator row in the presence of the rotor in a high pressure turbine. In this work, we investigate the influence of the spatial distribution of such grains on the submm appearance of magnetized protoplanetary disks. The basic axisymmetric structural element analyzed is the conical shell, and its. Application of nonaxisymmetric endwall contouring to conventional. In this paper, a non axisymmetric endwall design method for the stator casing is implemented through a novel surface definition, towards mitigating secondary flow losses. The effect of nonaxisymmetric endwall contouring on compressors is not clear. The whole process should not take more than a couple of minutes. Axisymmetric finite element modeling for the design and.
A geometry generation framework for contoured endwalls. This technology is based on the principle that convexity curvature of the wall can locally. Optimization of the axisymmetric and the nonaxisymmetric endwall. Figure 1 gedora screw wrenches 8 one of the typical applications of non axisymmetric cold extrusion is a mass production of gedora screw. Optimization of endwall contouring in axial compressor sshaped. Offaxis conic surfaces for nonaxisymmetric surface.
Non axisymmetric endwall is first used in the turbines to make the flow field of stator more uniform and reduce the secondary flow losses 1,2. Pdf a nonaxisymmetric endwall profile has been designed using cfd with the aim of reducing. Endwall contouring optimization in a high pressure turbine. Optimization strategy for a singlestage axisymmetric hub. The timeresolved flowfield is measured in the passage of a linear turbine cascade to show the effects of endwall film cooling and non axisymmetric endwall contouring on the passage secondary flows. The overall nonaxisymmetric geometry is reduced by selecting a tilt angle balancing the figure in the meridional plane at the extreme radial positions. Cfd investigation on the application of optimum non. Axisymmetric definition and meaning collins english. Pdf nonaxisymmetric turbine end wall profiling researchgate. Secondary flows presence in turbines is identified as one of the main reason for losses and less efficiency performance. Flow feature in a turbine cascade with endwall profiling, journal of. This study investigates the control mechanism of nonaxisymmetric endwall on the flow field of a highly loaded compressor cascade and the guidelines for the design of nonaxisymmetric endwall. Nonaxisymmetric endwall profiling in a turbine rotor.
In proceedings of the asme 1994 international gas turbine and aeroengine congress and exposition, the hague, the netherlands, 16 june 1994. We achieved the convex growth interface shape in topseeded solution growth of sic applying nonaxisymmetric solution convection induced by nonaxisymmetric temperature distribution. Nonaxisymmetric endwall profiling in the hp ngvs of an axial flow gas turbine. Turbine technical conference and exposition, american soc. Proceedings of the international gas turbine and aerospace. Axisymmetric flow article about axisymmetric flow by the. Control of interface shape by nonaxisymmetric solution. The endwalls were generated parametrically with a sinusoidal profile applied in the. Jun 26, 2019 the student community is a public forum for authorized ansys academic product users to share ideas and ask questions. Pdf nonaxisymmetric endwall profiling in a turbine rotor blade. In the present case, the solution flow below the crystal was. Turbine blade row optimization through endwall contouring. Development of an automated nonaxisymmetric endwall.
The purpose was to reduce coolant leakage as proposed by rose 1994. Nonaxisymmetric endwall profiling in the hp ngvs of an axial flow gas turbine, asme 1994. Axisymmetric endwall contour for a highlift low pressure turbine blade be. This paper describes the effects of nonaxisymmetric endwall profiling on the aerodynamic performance of a linear turbine cascade at different incidence angles. Axisymmetric analysis a problem in which the geometry. Generate mapped mesh of linear mesh200 elements on the surface of 3d model that connects to the axisymmetric section.