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| Experimental Study on Characteristics of Subcooling/Flash Boiling/Supercritical Fuel Spray |
| DOI：10.13949/j.cnki.nrjgc.2023.01.012 |
| Key Words:supercritical spray spray characteristic concentration distribution widom line pseudo-boiling |
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| Abstract:The high-speed Mie scattering imaging technology and ultraviolet-visible laser absorption/scattering technique were used to measure the macroscopic characteristics（the liquid or gas penetration and projection area） and the concentration field distribution of the supercooled/flash/supercritical spray， and the atomization process and the important role of the pseudo-boiling line of supercritical spray were discussed. The results show that the atomization process of supercritical spray can be divided into the liquid-like spray and gas-like spray according to the pseudo-boiling line. The liquid penetration and projection area of supercritical spray are much smaller than those of supercooled spray and flash spray. The development speed of gas penetration is much faster than that of supercooled spray and flash spray. Under the same injection pressure， the gas phase projection area shows a logarithmic function relationship with time， and is almost independent of injection temperature. During 5 MPa~20 MPa， using a supercritical injection strategy is more conducive to accelerating evaporation and improving atomization effect than increasing injection pressure. The supercritical spray concentration distribution is more uniform. |
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