This paper reports a traverse survey of the flow conditions at the exhaust pipe of two mixed-flow turbines. The experimental method is described and the results discussed. It shows that for both turbines, a shroud-hub flow migration might be generated within the blades at higher pressure ratios, which relieves the high blade loading at the shroud, and a flow separation from the suction side of the hub might occur at the lower pressure ratios. The turbine with ‘constant incidence angle’ rotor design suffered from greater swirl loss and a possible internal flow separation than the one with a constant blade inlet angle.
WallaceF. J.A systematic approach to the design of radial inflow and mixed flow turbines. Aeronautic Research Council, C.P. 1180, 1971.
2.
WallaceF. J.BainesN. C.WhitfieldA.A unified approach to the one-dimensional analysis and design of radial and mixed flow turbines. ASME paper 76-GT-100, 1976.
3.
BainesN. C.WallaceF. J.WhitfieldA.Computer-aided design of mixed flow turbines for turbochargersTrans. ASME, J. Engng Power, 1978, 100.
4.
ChouC. C.GibbsC. A.The design and testing of a mixed flow turbine for turbochargers. SAE paper 890644, 1989.
5.
NaguibM.Experience with the modern RR151 turbocharger for high-speed diesel engines. In Second International Conference on Turbocharging and Turbochargers, 1986, pp. 105–112 (Mechanical Engineering Publications, London).
6.
YamaguchiH.NishiyamaT.HorlaiK.KasuyaT.High performance Komatsu KTR 150 turbocharger. SAE paper 840019, 1984.
7.
AbidatM.ChenH.BainesN. C.FirthM. R.Design of a highly loaded mixed flow turbineProc. Instn Mech. Engrs, Part A, 1992, 206, 95–107.
8.
PullenK. R.Design and development of a small gas turbine and high speed generator. PhD thesis, Imperial College, University of London, 1991.
9.
ReinschC. H.Smoothing by spline functionsNumer. Math., 1967, 10, 177–183.
10.
Ricardo and Company Engineers Limited. Radial inflow turbine. Report on cold tests, steady flow v. pulse flow. DP. 7547, 10 December 1963.
11.
Ricardo and Company Engineers Limited. D.I.G.T. radial inflow turbine cold tests on turbine B, turbine A and turbine D. D.I.G.T. report 15-R-5, November 1960.
12.
FutralS. M.HoleskiD. E.Experimental performance evaluation of a 6.02-inch (15.29-cm) radial-inflow turbine with an exit diffuser. NASA TM X-1480, 1967.
13.
RohlikH. E.Analytical determination of radial inflow turbine design geometry for maximum efficiency. NASA TN-D 4384, 1968.
