Experimental study on water mist evaporative cooling in power machine exhaust system

Aiming at understanding the cooling performance of the devised water mist evaporative cooler for the engine exhaust gas, an exhaust gas spray cooling test-bed was set up, and the gas temperature and pressure loss was measured when the water was sprayed into the exhaust gas using the designed protected type gas temperature measuring device and the pressure loss measuring device. Results indicate that when the cooler sprays water mist into the exhaust gas, the gas temperature drops immediately to steady temperature in 80 s. The pressure loss decreases after introducing the water mist into the exhaust gas. The bigger the atomizing pressure, the bigger the water flow rate, the better the spray cooling effect, and the smaller the pressure loss. The saturation temperature of the liquid water corresponding to the gas outlet pressure can be regarded as the gas cooling terminal temperature.