A quantitative visual study of a correctly-expanded supersonic jet of a Mach number of 1.6 by the rainbow schlieren deflectometry has been conducted to reveal the jet flow field quantitatively. Rainbow schlieren images of the jet have been taken by a schlieren system with a rainbow filter which has a continuous hue distribution. The density contour plot of the jet flow is determined by using the image analysis based on the Abel inversion of experimental data of transverse displacement at the cutoff plane. Also, Pitot probe measurements at a jet cross-section have been carried out to obtain density profiles. The radial distribution of the density from the schlieren quantitatively agrees well with that from the Pitot probe.
The experimentaI results 〔 }f the ch 〔, king pressure ratio and the choked 日ow rate in u c nverging nezzle are con / pared with three theoretical values calculated by the Fanno 且 w theory , the compound fioLv mode1 , and thc average now rn 〔 〕deL The experiment . atvalues are in qualita 亡 ive agreenler ユt with the calculated va ] ues in any of these cases , and agree best with the 、 ・ alucs by し he average 飾 w m σde1 . Based upon thcse compar 孟 sons , the mechanism of the choking of the flow where し he velocity distTibutic 〕ll is n { 〕t uniform due to the beundary 】 ayer is rnade dear ,
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