FLOW OF A VISCOUS GAS IN A DIFFUSER CHANNEL WITH TURBULATORS
DOI:
https://doi.org/10.18372/2310-5461.34.11618Keywords:
public management, state informative resources, public information, public state informative resources, public informative system, system of public managementAbstract
A calculation series of flow in smooth diffusers with an opening angle α = 6 ... 40º was carried out. Turbulent separated flows were calculated using the averaged Navier-Stokes equations with the turbulence model SST. The results of flow numerical simulation in smooth diffusers have shown that at α> 20º there is a flow separation, which is accompanied by the formation of a back-circulation flow in the form of vortices. The energy losses increase with increasing of the angle o f the diffuser opening. The paper presents the results of a study of the effect of the density of the accommodation of turbulators in a diffuser channel with a large opening angle of the diffuser at Mach number M = 0.5. The characteristics of the diffusers were studied at a turbulator density coefficient of 0.5; 0.25; 0.125. The use of turbulators at the entrance section of the diffuser channel with a density coefficient of 0.125 ... 0.5 resulted in a decreasing of the value of the total pressure loss coefficient from 0.3 to 0.19 ... 0.22.
References
Чжен П. Управление отрывом потока / П. Чжен. – М.: Мир, 1979. – 552 с.
Терещенко Ю. М. Аэродинамическое совершенствование лопаточных аппаратов компрессоров / Ю. М. Терещенко. – М.: Машиностроение, 1987. – 168 с.
Терещенко Ю. М. Моделювання течії в компресорних решітках з турбулізаторами на поверхні лопаток / Ю. М. Терещенко, К.В. Дорошенко, Ю. Ю. Терещенко // Наукоємні технології. – 2016. – №. 3 (31). – P. 335–352, doi: 10.18372/2310-5461.31.10804 (ukr)
Back S. C. Effects of reynolds number and surface roughness magnitude and location on compressor cascade performance / S.C. Back, G.V. Hobson, S. J. Song, K.T. Millsaps // Journal of Turbomachinery. – 2012. – Vol. 134, Issue 5. – P. 051013-1–051013-6, doi: 10.1115/1.4003821 (eng)
Back S. C. Impact of surface roughness on compressor cascade performance / S.C Back, J. H. Sohn, S. J. Song // Journal of Fluids Engineering. – 2010. – Vol. 132, Issue 6. – P. 064502-1-064502-6, doi: 10.1115/1.4001788 (eng)
Yang H. The effect of blade profile parameter on thermodynamic performance parameter of axial flow compressor / H. Yang, H. Xu / International Journal of Computer Applications in Technology. – 2014. – Vol. 50, Issue 3-4. – P. 247-252, doi: 10.1504/IJCAT.2014.066736 (eng)
Taylor R. P. Surface roughness measurements on gas turbine blades / R. P. Taylor // Journal of Turbomachinery. – 1990. – Vol. 112, Issue 3. – P. 175–180, doi: 10.1115/1.2927630 (eng)
Bogard D. G. Characterization and laboratory simulation of turbine airfoil surface roughness and associated heated transfer / D. G. Bogard, D. L. Schmidt, M. Tabbita // Journal of Turbomachinery. – 1998. – Vol. 120, Issue 2. – P. 337–342, doi: 10.1115/96-GT-386 (eng)
Терещенко Ю. М. Моделирование течения в диффузоном канале с турбулизаторами / Ю.М. Терещенко, Е. В. Дорошенко, Л. Г. Волянская // Восточно-европейский журнал передовых технологий. – 2013. - №4/7(64). – С.36-38. (rus)
