Natural gas hydrogen-doped jet flow field test system and method

The invention discloses a natural gas hydrogen-doped jet flow field test system and method, the system comprises a gas supply system, a gas mixing chamber, a test cabin and a data acquisition system, the gas supply system comprises a natural gas cylinder for gas supply, a hydrogen cylinder, a pressure reducing valve, a temperature and pressure compensation type vortex shedding flowmeter, a temperature sensor and a pressure sensor; the gas supply system can provide hydrogen-doped natural gas with different proportions into the mixing chamber, and the gas can be fully mixed in the mixing chamber and then enters the test cabin; the test cabin comprises a temperature and pressure compensation type vortex shedding flowmeter for testing mixed gas, an adjustable gas nozzle, a high-speed camera and a schlieren instrument; the schlieren instrument can realize high-precision and high-spatial-resolution flow field recording. According to the invention, flow field measurement of hydrogen-doped natural gas in binary or mu