Pavel V. Bulat

INTERFERENCE OF COUNTERPROPAGATING SHOCK WAVES

УДК 532.529 ИНТЕРФЕРЕНЦИЯ ВСТРЕЧНЫХ СКАЧКОВ УПЛОТНЕНИЯ П.В. Булат, П.В. Денисенко, Н.В. Продан a Университет ИТМО, Санкт-Петербург, 197101, Российская Федерация b Университет Уорвика, Ковентри, CV4 7AL, Великобритания Адрес для переписки: pavelbulat@mail.ru Информация о статье Поступила в редакцию 20.02.15, принята к печати 26.02.15 doi:10.17586/2226-1494-2015-15-2-346-355 Язык статьи – русский Ссылка для цитирования: Булат П.В., Денисенко П.В., Продан Н.В. Интерференция встречных скачков уплотнения // Научнотехнический вестник информационных технологий, механики и оптики. 2015. Том 15. No 2. С. 346–355.

ON THE POSSIBILITY OF BURNING ACCELERATION IN THE COMBUSTION CHAMBERS OF ADVANCED JET ENGINES BY DEEPLY SUBCRITICAL MICROWAVE DISCHARGE

The paper deals with the problem of increasing the speed of propagation of the flame front as applied to the problems of reducing noxious emissions of nitrogen oxides formed during operation of jet engines and industrial turbines, as well as the stabilization of a supersonic combustion. We investigate the possibility of reducing the induction time using non-equilibrium cold plasma produced by an electromagnetic vibrator in beam quasi-optical MW radiation. The positive effect of cold non-equilibrium plasma on increasing the rate of occurrence of oxidation reactions in the air is well known and undisputed. The presented results of the experiments demonstrate the advantage of the method developed in terms of efficiency and suppression of nitrogen oxide emissions. Also they show that combustion stabilization is achieved similarly in a supersonic flow.

On the Concept of the Wave Compressor and Optimal Shock-Wave Structures

Objectives: This paper considers the concept of shock wave compressor in which the compression occurs not in the impeller machine, but in the optimal system of triple shock waves configurations. Methods/Analysis: A review of the works being conducted in the world in this field is provided. The basics of the gas-dynamic discontinuities interference theory are given; the development sequence of the theory of optimal (extreme) shock-wave structures is shown. Findings: The task of designing a new gas compression device - the shock-wave compressor is considered. Differences from other similar devices are discussed. The model air intake tract for the wave compressor is designed. The calculations of the model wave machine are provided. Comparison with multistage axial compressor shows that starting with a compression ratio of 25, the degree of full throating pressure restoration, provided by a shock wave compressor is not smaller than that of an impeller machine. Although, the size and weight of the shock wave compressor is much lower. Novelty/Improvement: Relevant is the task of reducing the size and decreasing the number of stages in the high-pressure compressors of refrigerators and other turbomachinery. Our results allow us to offer the concept of the compressor in which the number of stages is significantly reduced through the use of a gas compression in optimal shock-wave structures. The potential advantage in comparison to the traditional axial compressors is demonstrated.