The applicability of the calibration method for heat flux sensors based on anisotropic bismuth thermoelements and a heterogeneous copper-nickel structure using a reflected shock wave to determine the volt-watt coefficient is demonstrated. The coefficient obtained for a sensor based on anisotropic thermoelements is close to the stationary calibration data, and for a sensor based on a heterogeneous structure, to the results of numerical simulation.

An analysis of main features of unsteady heat flux measuring in shock tubes experiments with a characteristic process time of ~1 μs - 1 ms using sensors based on anisotropic bismuth thermoelements is made. The heat flux behind the reflected shock wave and at the blunt body stagnation point has been measured. Testing of the heat flux calculation method was carried out. The difference between the experimental data and the theoretical value of the heat flux does not exceed 50%. The possible reasons influencing the magnitude of measurement uncertainty are analyzed. The experiments performed have shown the applicability of a sensor based on anisotropic thermoelements and the method for calculating the heat flux from its electrical signal for typical conditions of experiments on shock tubes.

Experimental investigations of the emission spectrum of a CaO molecule behind the front of a reflected shock wave on a 50 mm diameter shock tube at the Ioffe Institute are carried out. The spectra were obtained using a compact spectrometer, as well as using a spectrometer based on an upgraded MDR-12 monochromator and a Sony SLT-A77 camera as a radiation detector. The emission spectra of CaO at different gas temperatures were obtained. The results can be used to test theoretical models of the emission spectrum of the CaO molecule at different temperatures.