Experimental investigation of far wakes behind two-dimensional slender bodies at M sub infinity equals 6

Abstract

An experimental investigation has been conducted at M^ = 6 to determine mean flow properties for far wakes behind several two-dimensional slender bodies at zero angle of attack. The adiabatic wall configurations tested included a flat-plate model and two 20° wedge models which differed by a factor of two in base height. The effect of wall temperature was examined by cooling the larger wedge model to a temperature of about two tenths of the freestream stagnation temperature. Freestream Reynolds numbers were varied from 50,000 to 200,000 per in. for each of these four configurations. Profile measurements of total temperature and Pitot pressure were combined with centerline static pressures to determine completely the far-wake flowfield from the wake neck downstream to the linear far wake. The effect of transition on mean flow properties was determined. Comparison of laminar wake data for adiabatic wall models with linear wake theory was favorable. Maximum centerline pressures in the far wake for all configurations were generally 10% higher than the freestream pressure. For the cold wall wedge the maximum centerline enthalpy for all cases occurred two base heights downstream of the model base and was triple the magnitude of the freestream enthalpy. The decay rate of enthalpy was "small" when the far wake was laminar.

An Experimental Study of Hypersonic Wakes behind Wedges at Angle of Attack

“…(4,5,6,16) Good agreement between these surveys was observed. The static pressure variations along the centerline of the tunnel conducted by Batt( 6 ) were adopted to normalize the static pressure survey in the present tests.…”

“…Two wedges of 20° included angle which were originally used by Batt ( 6 ) in his surveys of hypersonic wake behind wedges at zero angle of attack were used for the present test. These two models were fabricated from solid pieces of Ketos steel and had base heights of 0.15 in.…”

An experimental study of the near wake of a slender cone at varying incidence at M [infty infinity] = 7

“…The Pitot pressure probe was a cylindrical tube of external diameter 1 mm. The effects of displacement of the streamlines were evaluated using the results of Dewey (1965) and Batt (1967) and found to be small. The effect of misalignment of the probe with the local flow was investigated and found to be smaller than 1% up to 10' incidence and less than 4 yo up to 20" incidence.…”

“…The static pressure probe was constructed following the method of Behrens (1963) and Batt (1967). A small 10" half-angle cone is followed by a 1 mm diameter cylinder with four lateral holes for wall pressure measurements.…”

“…A differential pressure probe was constructed using the method suggested by Batt (1967), to determine the location of the u = 0 line, along which the longitudinal component of the velocity is zero. This probe consists of pressure leads shaped like half-loops sealed together at their ends at the centre-line.…”