Direct measurements at Mach 6 of turbulent skin-friction reduction by injection from single and multiple flush slots

Srokowski, A. J.; Howard, F. G.; Feller, William

doi:10.2514/6.1976-178

Cited by 3 publications

(1 citation statement)

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“…The lower the slot flow momentum, the faster the mixing with the external flow, and the faster the slot flow loses its identity. 7 The velocity gradient can also be reduced by the thickening of the boundary layer, which results from the injection of the secondary fluid. 8 Alternatively, the use of lower density gases (for example, hydrogen) can reduce the viscosity of the boundary-layer flow and, therefore, the skin friction in the near wall region.…”

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confidence: 99%

Performance of a Scramjet Combustor with Combined Normal and Tangential Fuel Injection

Rowan

Paull

2006

Journal of Propulsion and Power

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The performance of a scramjet combustor with combined normal and tangential injection was experimentally investigated. Experiments were performed on a 500-mm cylindrical scramjet combustor at a freestream Mach number of 4.5, a nozzle supply pressure of 35.8 MPa, and a nozzle supply enthalpy of 5.8 MJ/kg. Hydrogen fuel was injected normally through portholes to promote combustion and tangentially through a slot to reduce viscous drag. A series of fuel injectors were used to vary the proportion of tangential to normal fuel between 45 and 100%. Reductions in the viscous drag of up to 25% were observed with the greatest reductions occurring at the lowest total equivalence ratio tested for each injector. However, the average pressure produced by combustion with combined normal and tangential injection was approximately 50% less than that produced by normal injection alone. An analysis of the change in specific impulse of the scramjet combustor indicated that the best overall performance was produced by 100% normal injection. Nomenclature= equivalence ratio Subscripts p, port = porthole s, slot = slot t, tot = total Superscript * = property at throat

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confidence: 99%