Experimental Research On Atomization And Combustion Of Gas/liquid Coaxial Swirling Nozzle Under Normal Pressure
- Paper number
IAC-07-C4.3.07
- Author
Prof. jinxian Li, Northwestern Polytechnical University, China
- Coauthor
Mr. Haobo He, Northwestern Polytechnical University, China
- Coauthor
Mr. Chunguo Yue, Northwestern Polytechnical University, China
- Coauthor
Mr. Xiping Feng, Northwestern Polytechnical University, China
- Year
2007
- Abstract
First of all, experimental researches in allusion to the performances of two kind of coaxial Gas/Liquid nozzles were done in the paper, in which liquid was injected tangentially through outer tube and gas through inner tube. According to similar theory, two kind of different coaxial nozzles models were designed which were a dual-swirling nozzle and a dual-directing nozzle.Besides,the act of measuring of cold flow atomization parameters and ignition experiment of another nozzle were done for comparative research, in which liquid was injected through inner tube and gas through outer tube.Parameters of spray flow field had been measured with the support of Phase Doppler Particle Analyzer (PDPA). The droplets parameters of spray flow field under normal pressure and burning condition were acquired. The characteristic experiments of atomization combustion were divided into two parts.First, combustibility and security of spray flow were validated. Possible measure regions of atomization parameters also were confirmed initially; Secondly, measures of combustion spray flow parameters were done. When working conditions of measure were confirmed according to adjustment results of ignition and working conditions parameters, working conditions parameters of nozzles on the basis of getting stably burning blaze must be consonant with cold flow simulation as much as possible in order to contrastive analysis.By the experiments, particle diameter and velocity of droplets and flow intensity distribution etc in spray field were measured under normal pressure and burning condition.The performances of nozzles’ atomization and combustion were concluded and analyzed. Spray conditions of the nozzle under normal pressure and burning condition to get stable combustion were acquired. The conclusions below were acquired with analysis and contrast of the data: 1) For gas nozzles, Linear relation was existed in flux and pressure difference; For liquid nozzles Flux and power 0.46 of pressure difference were direct ratio approximatively; 2) The cold atomization performances of the three kind of nozzles were acquired initially. Atomization rule and similarities and differences of atomization characteristics and parameters of among the nozzles were analyzed; 3) The existing regions of droplets and atomization parameters in the flow-field of the two kind of Gas/Liquid coaxial nozzles were confirmed initially. The variational rules of droplets parameters under normal pressure and combustion condition were analyzed, which also were compared with cold experimental results; 4) The combustion blaze intensity of spray flow was influenced by pressure difference variety of gas and liquid. The stable combustion condition which spray velocity must less than 40m/s of the researched coaxial Gas/Liquid nozzles was showed initially.
- Abstract document
- Manuscript document
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