An experimental investigation of the rate of heat transfer to the insulator wall of a quasi-steady magnetogasdynamic accelerator is described. The experiments were conducted in an accelerator section attached to the end of a shock tube using argon as the test gas. The measurements are compared with a Hartmann boundary-layer analysis, which correlates the data within the experimental scatter. Based on this theory, estimates of the current shorting through the boundary layer and energy fluxes to the wall are made and compared with the accelerator’s overall performance.

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