Near wake of a hypersonic blunt body with mass addition
An experimental investigation of the steady, laminar near-wake flowfield of a two-dimensional, adiabatic, circular cylinder ·with surface mass transfer has been made at a freestream Mach number of 6.0. The pressure and mass- concentration fields associated with the transfer of argon, nitrogen, or helium into the near wake were studied for mass transfer from the forward stagnation region, and from the base. For sufficiently low mass transfer rates from the base, for which a recirculating zone exists, the entire near-wake flowfield correlates with the momentum flux, not the mass flux, of the injectant, and the mass-concentration field is determined by counter-current diffusion into the reversed flow. For mass addition from the forward stagnation region, the pressure field is undisturbed and the mass- concentration field is nearly uniform in the region of reversed flow. The axial decay of argon mass concentration in the intermediate wake, downstream of the neck, is explained with the aid of an integral solution in the incompressible plane, from which the location of the virtual origin for the asymptotic far-wake solution has been derived as one result.
Additional Information© 1970 AIAA. Presented as Paper 69-67 at the AIAA 7th Aerospace Sciences Meeting, New York, January 20- 22, 1969; submitted December 23, 1968; revision received July 28, 1969. The work discussed in this paper was carried out under the sponsorship and with the financial support of the U.S. Army Research Office and the Advanced Research Projects Agency, Contract DA-31-124-ARO(D)-33. This research is a part of Project DEFENDER sponsored by the Advanced Research Projects Agency.
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