Abstract
The United States Air Force (USAF)/Arnold Engineering Development Center (AEDC) has undertaken an arc heater development program to develop a large, high-pressure, high-power arc heater capability for use as a source of highenthalpy air for aerothermal testing. A large, stateof-the-art segmented arc heater, designated H3, with a 3-in.-diam constrictor, has been operated at pressures up to 119 atm, powers up to 68 MW, and mass flows up to 18 Ibm/sec. Enthalpies as high as 4,700 Btu/lbm at a total pressure of 33 atm and 3,000 Btu/lbm at 107 atm have been demonstrated. The H3 arc heater is a 50-percent geometric scaleup of the existing H1 segmented arc heater and is designed to operate at 2.25 to 2.75 times the power of the 2-in. constrictor diameter H1 arc heater. Nondimensional scaling law correlations have been applied to evaluate the performance of the new arc heater. The H3 arc heater represents a significant advance in testing capabilities in the areas of free-jet to atmosphere testing, expanded flow testing, and direct-connect combustor testing. This paper describes recent test results obtained during the H3 development test entry, along with nondimensiona! scaling law correlations developed using newly acquired H3 data.
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