Abstract:
High enthalpy shock tunnel is the main ground testing equipment for the study of high enthalpy flows. The experimental technology of high enthalpy shock tunnel mainly includes the driver technology, the detection technology, and the testing technology. The driver methods determine the achievable total enthalpy and pressure level in the test section. These methods contain variable cross section driver, multicascade compression driver, light gases driver, and heated light gases driver. The extremely high temperature is produced in the high enthalpy shock tunnel. The high temperature leads to the melting effects at the end of shock tube and nozzle throat, resulting in the driver gas contamination in the flow field. It is difficult to analyze the test results due to the component dissociation and the frozen vibration temperature. The free stream condition, the duration of the working time, and the delay technology of driver gas contamination are confirmed by the detection technology, which plays the primary role in high enthalpy shock tunnel. There are not only high total temperature and pressure in high enthalpy shock tunnel, but also the duration of the working time is only several milliseconds, which bring more level high standard of the testing technique is required for high enthalpy shock tunnel in consideration of high total temperature, high pressure, and the only several milliseconds duration of the working time. The research progress of the related technology is introduced, and an emphasized introduction is given for the testing technology of aerodynamic force/heat and the flow field physical-chemical parameters. The direction of the further technological development is pointed out, which can provide references for the development and application of large-scale high enthalpy shock tunnel.