Viscous throughflow modeling of axial compressor bladerows using a tangential blade force hypothesis
- Rolls-Royce PLC, Derby (United Kingdom)
This paper describes the modeling of axial compressor blade rows in an axisymmetric viscous throughflow method. The basic method, which has been reported previously, includes the effects of spanwise mixing, using a turbulent diffusion model, and endwall shear within the throughflow calculation. The blades are modeled using a combination of existing two-dimensional blade performance predictions for loss and deviation away from the annulus walls and a novel approach using tangential blade forces in the endwall regions. Relatively simple assumptions about the behavior of the tangential static pressure force imposed by the blades allow the secondary deviations produced by tip clearance flows and the boundary layer flows at fixed blade ends to be calculated in the axisymmetric model. Additional losses are assigned in these regions based on the calculated deviations. The resulting method gives realistic radial distributions of loss and deviation across the whole span at both design and off-design operating conditions, providing a quick method of estimating the magnitudes of these effects in the preliminary design process. Results from the method are compared to measured data in low and high-speed compressors and multistage three-dimensional viscous CFD predictions.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 316081
- Report Number(s):
- CONF-970604-; ISSN 0889-504X; TRN: IM9908%%161
- Journal Information:
- Journal of Turbomachinery, Vol. 120, Issue 4; Conference: 42. international gas turbine and aeroengine congress and exhibition, Orlando, FL (United States), 2-5 Jun 1997; Other Information: PBD: Oct 1998
- Country of Publication:
- United States
- Language:
- English
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