Abstract
The swirl-type injector used formerly as a single-point injector has faults, in that, it becomes difficult to generate a thin fuel film at a low fuel flow rate. A new type of single-point injector was proposed in this paper to solve the above problem and to improve its atomization performance. It is a impingement-type injector. Liquid fuel jets impinge on the solid wall, and the thin liquid film is issued from the injector. This type of injector has the following advantages. (1) The impingement-type injector can generate a thin liquid film even at a lower liquid flow rate. (2) The liquid film issued from the impingement-type injector is thinner and spread out more widely. The drops generated by the disintegration of the liquid film are finer. (3) The circumferential mass flux distribution of drops is more uniform. (4) The upwash generated by the impingement of the films promotes film spreading. However, a large upwash limits the uniform circumferential distribution of drop mass flux.
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