Wave structure and flow amplitude-frequency characteristics in the turbine nozzle lattice in the presence of phase transition
| العنوان: | Wave structure and flow amplitude-frequency characteristics in the turbine nozzle lattice in the presence of phase transition |
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| المؤلفون: | R. A. Alekseev, V. A. Tishchenko, I. Yu. Gavrilov, V. G. Gribin, A. A. Tishchenko |
| المصدر: | Thermal Engineering. 64:379-386 |
| بيانات النشر: | Pleiades Publishing Ltd, 2017. |
| سنة النشر: | 2017 |
| مصطلحات موضوعية: | Engineering, business.industry, Nozzle, Energy Engineering and Power Technology, Mechanical engineering, 02 engineering and technology, Mechanics, Static pressure, 01 natural sciences, Turbine, 010305 fluids & plasmas, Physics::Fluid Dynamics, symbols.namesake, Amplitude, 020401 chemical engineering, Nuclear Energy and Engineering, Mach number, Cascade, 0103 physical sciences, symbols, Supersonic speed, 0204 chemical engineering, business, Adiabatic process |
| الوصف: | This paper is devoted to the wave structure of a flow at its near- and supersonic velocities in a flat turbine cascade of profiles in the zone of phase transitions. The main task was investigation of the mechanics of interaction of the condensation jump with the adiabatic jumps of packing in a change of the initial condition of the flow. The obtained results are necessary for verification of the calculation models of the moisture-steam flow in the elements of lotic parts of the steam turbines. The experimental tests were made on a stand of the wet steam contour (WSC-2) in the Moscow Power Engineering Institute (MPEI, National Research University) at various initial states of steam in a wide range of Mach numbers. In the investigation of the wave structure, use was made of an instrument based on the Schlieren-method principle. The amplitude-frequency characteristics of the flow was found by measurement of static pressure pulsations by means of the piezo resistive sensors established on a bandage plate along the bevel cut of the cascade. It is shown that appearance of phase transitions in the bevel cut of the nozzle turbine cascade leads to a change in the wave structure of the flow. In case of condensation jump, the system of adiabatic jumps in the bevel cut of the cascade becomes nonstationary, and the amplitude-frequency characteristics of static pressure pulsations are restructured. In this, a change in the frequency pulsations of pressure and amplitude takes place. It is noted that, at near-sonic speeds of the flow and the state of saturation at the input, the low-frequency pulsations of static pressure appear that lead to periodic disappearance of the condensation jump and of the adiabatic jump. As a result, in this mode, the flow discharge variations take place. |
| تدمد: | 1555-6301 0040-6015 |
| DOI: | 10.1134/s004060151703003x |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::d8304f6763a121e6f9bb1d8d0d3a5884 https://doi.org/10.1134/s004060151703003x |
| Rights: | CLOSED |
| رقم الانضمام: | edsair.doi...........d8304f6763a121e6f9bb1d8d0d3a5884 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15556301 00406015 |
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| DOI: | 10.1134/s004060151703003x |