Three-Dimensional Rainbow Schlieren Measurements in Underexpanded Sonic Jets from Axisymmetric Convergent Nozzles  

作　　者：Hirofumi TAKANO Daiyu KAMIKIHARA Daisuke ONO Shinichiro NAKAO Hideki YAMAMOTO Yoshiaki MIYAZATO 

机构地区：[1]The University of Kitakyushu,1-1,Wakamatsu,Kitakyushu,Fukuoka,808-0135,Japan [2]The University of Kitakyushu,1-1,Wakamatsu,Kitakyushu,Fukuoka,808-0135,Japan

出　　处：《Journal of Thermal Science》2016年第1期78-83,共6页热科学学报（英文版）

基　　金：funded by Grant-in-Aid for Scientic Research(C)No.15K05804 of Japan Society for the Promotion of Science and supported in part by the 2014 Grant for Specially Promoted Research of the Institute of Environmental Science and Technology,The University of Kitakyushu

摘　　要：The rainbow schlieren deflectometry has been combined with the computed tomography to obtain three-dimensional density fields of shock containing free jets and we call the method the schlieren CT. Experiments on the schlieren CT have been performed at a nozzle pressure ratio of 4.0 by using an axisymmetric convergent nozzle with an inner diameter of 10 mm at the exit where the nozzle was operated at an underexpanded condition. Multidirectional rainbow schlieren pictures of an underexpanded sonic jet can be acquired by rotating the nozzle about its longitudinal axis in equal angular intervals and the three-dimensional density fields are reconstructed by the schlieren CT. The validity of the schlieren CT is verified by a comparison with the density fields reconstructed by the Abel inversion method. As a result, it is found that excellent quantitative agreement is reached between the three-dimensional jet density fields reconstructed from both methods.

关 键 词：Rainbow schlieren Computer tomography Convergent nozzle Sonic jet 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] O358[自动化与计算机技术—计算机科学与技术]