Spatial Distribution of Gaseous Jet in Supersonic Crossflow

Abstract

The efficient delivery of gaseous fuel into supersonic airflow is very important in high-speed air-breathing engines, which require sufficient fuel–air mixing in the extremely short residence time within the engine combustor. The characteristics of the injected fuel plume, such as the penetration height, spanwise distribution, and concentration profiles, play an important role in ignition, flame holding, flame spreading, and combustion efficiency for a given flow path. In recent years, more and more experimental measurement technologies have been used to investigate the sonic jet in supersonic crossflow, which are given in Sect. 2.1. Jet penetration of sonic gaseous jet is discussed in Sect. 2.2. Spanwise distribution of gaseous jet and trajectory are summarized in Sect. 2.3. Moreover, near-wall information of sonic gaseous jet in supersonic crossflow is described in Sect. 2.4. Because numerical simulations of sonic jet in supersonic crossflow about penetration height, transverse distribution, and concentration profiles are usually compared with experimental results to prove the reliability of numerical simulations. (Or though numerical simulations can reproduce the detailed jet flowfield, the calculated results of penetration height, transverse distribution, and concentration profiles, however, lack the enough reliability.) Thus, we only discuss experimental research in this chapter.