Trapped Vortex Combustion Technology Research And Its Application In Combustion Chamber Diameter Of 11cm

On the basis of the 11 cm micro turbine engine, micro Trapped Vortex technology was deeply studied with both experimental and CFD method. Then, Trapped Vortex concept was successfully applied to 11cm micro combustor and was designed to be a Trapped Vortex Combustor. The experimental results show that new combustor could burn stably adopted liquid fuel and has higher combustion efficiency than conventional Micro-combustor.Firstly, some test work was done to determine whether experimental and CFD methods adopted by this paper were effective, as for experimental method, the influence of axial factor was considered by fixing measuring devices onto case to make sure that measurement points were paralleled with combustor outlet, radial factor was considered by setting 4 measuring points on the height of 14mm, circumferential influence was determined by measuring outlet temperature once every 12 degrees 10 times, thus there would be 120 points of outlet temperature, then a reasonable measuring program was determined. On CFD work of cold condition, the total pressure recovery coefficient of CFD results correspond with test results well and the maximum difference was under 2%, so the correctness of CFD method was validated elementarily.Secondly, system research and contrast analysis were done for four kinds of structure and varied pneumatic stators of micro Trapped Vortex Combustor parts. four kinds of structure were combinations of two power stream inlet structure and two cavity sizes, the results show that combustion performance was better when power stream inlet was lone hole but not circle hole; according to cavity ratio of foreign learners, new cavity ratio by removing centric axis has a better combustion performance. As for pneumatic parameters, on the basis of determining basic structure of combustor, the ratio of branch stream mass and power stream mass was found to achieve a combustion efficiency higher than 90% when equals or larger than 0.107 which could fulfill basic design need of combusor.Third, outlet temperature distribution of combustor was studied. A new method of disposing holes on outer ring for air mix was applied in this paper and tested through CFD and experimental study. After CFD validation, disposing holes on both outer and inner rings has little improvement on outlet temperature distribution. when using ratchet—petal mixer in the back of front body path, the experimental result shows that new method could improve outlet temperature distribution obviously but has a side effect on combustion stability and efficiency.Finally, on the basis of comprehensive analysis of work mentioned above, four kinds of 11cm micro Trapped Vortex Combustors were designed which contained two kinds of outlet area and two placement of vaporizing tube; research results showed that combustion efficiency was higher when the number of outlet holes was added to 1.5 times of original program and set with vaporizing tube 45 degrees. In contrast with traditional vaporizing tube micro combustor which belongs to same type, combustion efficiency has an increase of nearly 10 percent which was higher than 90% and new designed vaporizing tube TVC has a higher outlet temperature distributing coefficient of 0.5~1, however, under high air flow mass condition, pressure recovery factor has a decrease of nearly 5 percent.