Unsteady and Stochastic Behavior of the Kerosene Concentration in Crossflow

Abstract: Based on the high-speed camera shadow method, the unsteady and stochastic behavior of the kerosene concentration in crossflow is discussed. A set of high-frequency and high-precision liquid injection control device is designed. The unsteady characteristics are studied at the same conditions (P = 17 atm and K = 300 K) in the case of 20 ms continuous injection. The range of the fuel/air momentum ratio is equal to 55–72 and then the above process is repeated 100 times, using statistical test methods to study the stochastic behavior. The results show that in the time domain, the kerosene concentration in crossflow exhibits obvious unsteady characteristics, and the statistical results show that the concentration distribution at the inner edge and the central trajectory of the jet satisfies to Gaussian distribution. The statistical results of repeated tests show that the kerosene concentration in crossflow is stochastic, and its probability density distribution is Gaussian. The stochastic behavior at the outer edge is more obvious. With increase in the momentum ratio, the stochastic behavior becomes stronger.