A unique supersonic inlet flow field unsteady cascade experiment is described wherein the time-dependent pressure distribution within an harmonically oscillating airfoil cascade is quantitatively determined. The torsional frequency of oscillation and the inter-blade phase angle are precisely controlled by means of on-line digital computers. The dynamic data obtained include the chordwise distribution of the unsteady pressure magnitude and its phase lag as referenced to the airfoil motion. Parameters varied include the cascade inlet Mach number, the interblade phase angle, and the reduced frequency. The time-dependent data are correlated with state-of-the-art analytical predictions.

The work described in this paper is a part of the DOE/LeRC “Advanced Conversion Technology Project” (ACT). The program is a multiple contract effort with funding provided by the Department of Energy and Technical Program Management provided by NASA LeRC. The emphasis in this paper is the fuel flexible combustor technology developed under the “Low NOx Heavy Fuel Combustor Concept Program” for application to the Detroit Diesel Allison (DDA) Model 570-K industrial gas turbine engine. The technology, to achieve emission goals, emphasizes dry fuel-bound nitrogen (FBN), control of NOx can be effected through a stated combustor with a rich initial combustion zone. A rich/quench/lean (RQL) variable geometry combustor utilizes the technology that will be presented to achieve low NOx from alternate fuels containing FBN. The results will focus on emissions and durability for multifuel operation.

i n e r t and reacting, turbulent flows. The method and program involve a staggered g r i d system f o r a x i a l and r a d i a l v e l o c i t i e s and a l i n e r e l a x a t i o n technique f o r e f f i c i e n t s o l u t i o n o f the'equatwo-equation k-E model and combustion v i a a simple one-step chemical reaction model based on Arrhenius and eddy-breakup concepts f o r d i f f u s i o n o r premixed s i t u a t i o n s . The present analysis has been developed from previous iuork,l2 and i s Complementary t o the l e n g t t y and c o s t l y experimental approach t o gas turbine combustor development i s the t h e o r e t i c a l approach. I n t i o n s . Turbulence simulation i s by way o f a order t o advance the combustor d,esign prdcess a computer program i s needed which s t a r t s from hypotheses about the fundamental processes and p r e d i c t s the d i s t r i b u t i o n s o f velocity, concentrations, and temperature. Consideration i s aiven i n t h i s oaoer t o recent work i n t h e r e a d i l y extendable t o three-dimensional devGlopment and appiication o f a p r i m i t i v evariable f i n i t e difference s o l u t i o n procedure f o r turbulent, reacting, s w i r l i n g , r e c i r c u l a t i n g flows i n axisymnetric combustors. The p r i n c i p a l i n t e r e s t i s on application o f the analysis t o gas t u r b i n e combustors and on demonstration o f the u t i l i t y and p r e d i c t i v e c a p a b i l i t y o f the code as an aid i n combustor design.

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The work described in this paper is a part of the DOE/ LeRc “Advanced Conversion Technology Project” (ACT). The program is a multiple contract effort with funding provided by the Department of Energy and Technical Program Management provided by NASA LeRc. It is anticipated that future industrial gas turbine engines will require fuel flexibility. The emphasis in this paper is the fuel flexible combustor technology developed under the “Low NOx Heavy Fuel Combustor Concept Program” for application to the Detroit Diesel Allison (DDA) Model 570-K industrial gas turbine engine. The technology, to achieve emission goals, emphasizes dry NO, reduction methods. Due to the high levels of fuel bound nitrogen (FBN) control of NOx can be effected through a staged combustor with a rich initial combustion zone. A RICH/QUENCH/LEAN (RQL) variable geometry combustor is the technology that will be presented to achieve low NO, from alternate fuels containing FBN. The results will focus on emissions and durability for fuel flexible operation.