In the present mini-review,droplet impacting on a liquid pool,jet impingement,and binary droplet collision of nonreacting liquids are first summarized in terms of basic phenomena and the corresponding nondimensional p...In the present mini-review,droplet impacting on a liquid pool,jet impingement,and binary droplet collision of nonreacting liquids are first summarized in terms of basic phenomena and the corresponding nondimensional parameters.Then,two representative hypergolic bipropellant systems,a hypergolic fuel of N,N,N′,N′-tetramethylethylenediamine(TMEDA)and an oxidizer of white fuming nitric acid(WFNA)and a monoethanolamine-based fuel(MEA-NaBH4)and a high-density hydrogen peroxide(H2O2),are discussed in detail to unveil the rich underlying physics such as liquid-phase reaction,heat transfer,phase change,and gas-phase reaction.This review focuses on quantifying and interpreting the parametric dependence of the gas-phase ignition induced by droplet collision of liquid hypergolic propellants.The advances in droplet collision of hypergolic propellants are important for modeling the real hypergolic impinging-jet(spray)combustion and for the design optimization of orbit-maneuver rocket engines.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.12102437 and Grant No.52176134)The work at the City University of Hong Kong was additionally supported by grants from the Research Grants Council of the Hong Kong Special Administrative Region,China(Project No.CityU 15222421 and CityU 15218820).
文摘In the present mini-review,droplet impacting on a liquid pool,jet impingement,and binary droplet collision of nonreacting liquids are first summarized in terms of basic phenomena and the corresponding nondimensional parameters.Then,two representative hypergolic bipropellant systems,a hypergolic fuel of N,N,N′,N′-tetramethylethylenediamine(TMEDA)and an oxidizer of white fuming nitric acid(WFNA)and a monoethanolamine-based fuel(MEA-NaBH4)and a high-density hydrogen peroxide(H2O2),are discussed in detail to unveil the rich underlying physics such as liquid-phase reaction,heat transfer,phase change,and gas-phase reaction.This review focuses on quantifying and interpreting the parametric dependence of the gas-phase ignition induced by droplet collision of liquid hypergolic propellants.The advances in droplet collision of hypergolic propellants are important for modeling the real hypergolic impinging-jet(spray)combustion and for the design optimization of orbit-maneuver rocket engines.
