{"title":"Stability of Supersonic Boundary Layer with Internal Heat Supply and Injection of Homogeneous Gas through a Porous Wall","authors":"S. Gaponov","doi":"10.25205/2541-9447-2023-18-2-54-65","DOIUrl":"https://doi.org/10.25205/2541-9447-2023-18-2-54-65","url":null,"abstract":"The influence of the Mach number and Reynolds number on the stability of the boundary layer with internal heat supply and homogeneous gas injection through the porous wall is studied. At a fixed Mach numbers, the dependence of perturbation amplification rate on the distance to the plate leading edge is not monotonic. As the Reynolds number increases, the phase velocity tends to the velocity at the inflection generalizing point. Two-dimensional waves are the most growing in the boundary layer. With increasing Mach number and a fixed distance from the plate, edge there is a strong stabilization of the boundary layer. At M=4 the amplification rate maximum decreases in comparison with the corresponding value at M=0 by more than an magnitude order, and the length of the stable boundary layer increases by a factor of 2. At the same time, a frequency at the neutral curve critical point decreases by a factor of about three. It has been establishing that both in the absence of gas injection through a porous wall and in its presence, the internal heat supply has a stabilizing effect on the boundary layer. Within the adopted model of heat supply at M=3 the degree of amplification decreases by about one and a half times in comparison with the case without internal heating of the boundary layer","PeriodicalId":509351,"journal":{"name":"SIBERIAN JOURNAL OF PHYSICS","volume":"11 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139184860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. M. Borin, P. B. Gornostaev, O. Meshkov, A. S. Kuch’yanov, S. V. Reva
{"title":"Development and Testing of an Autocorrelator for Measuring the Duration of Picosecond Pulses of Near-infrared Radiation","authors":"V. M. Borin, P. B. Gornostaev, O. Meshkov, A. S. Kuch’yanov, S. V. Reva","doi":"10.25205/2541-9447-2023-18-2-16-25","DOIUrl":"https://doi.org/10.25205/2541-9447-2023-18-2-16-25","url":null,"abstract":"A scheme of an autocorrelator developed for measuring the duration of picosecond pulses of infrared radiation from the 3rd Novosibirsk Free Electron Laser is presented, as well as the results of approbation of the autocorrelator when measuring the duration of picosecond pulses in the visible range.","PeriodicalId":509351,"journal":{"name":"SIBERIAN JOURNAL OF PHYSICS","volume":"47 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139185094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. T. Orozobakov, B. B. Sayakbayeva, E. U. Orozobakov, N. A. Amankulova
{"title":"Determination of Total Stratospheric Ozone on Millimeter Waveband over the Central Asian Region","authors":"A. T. Orozobakov, B. B. Sayakbayeva, E. U. Orozobakov, N. A. Amankulova","doi":"10.25205/2541-9447-2023-18-2-5-15","DOIUrl":"https://doi.org/10.25205/2541-9447-2023-18-2-5-15","url":null,"abstract":"The principles of operation of the main blocks of the radio spectrometer of the millimeter range for the study of the ozone layer are presented. Some results of measurements of the altitude distribution of ozone over the region of Central Asia are presented, according to which the zones of maximum ozone concentration in height are confirmed, and total ozone is determined in the altitude range of 20‑60 km.","PeriodicalId":509351,"journal":{"name":"SIBERIAN JOURNAL OF PHYSICS","volume":"30 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139184956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}