A5057447173- Cavitation Phenomena in Pumps
- Hydraulic and Pneumatic Systems
- Water Systems and Optimization
- Hydraulic flow and structures
- Fluid Dynamics and Turbulent Flows
- Solar and Space Plasma Dynamics
- Computational Fluid Dynamics and Aerodynamics
- Combustion and flame dynamics
- Cyclone Separators and Fluid Dynamics
- Fluid Dynamics Simulations and Interactions
Heilongjiang Institute of Technology
2023
Harbin Institute of Technology
2017-2023
Stall phenomenon, a classical physical phenomenon which is located in the vaneless region of pump–turbine and accompanied by complex vortex evolution process, strongly related to formation hump unsteady at pump mode S turbine mode. In present paper, detached eddy simulation model employed numerically investigate impact runner high-pressure side (HPS) on stall characteristics typical operating points, namely, valley point runaway It found that both investigated points are obviously changed:...
Pump performance characteristics of pump turbines in transient processes are significantly different from those steady processes. In the present paper, a flow rate that increased and decreased mode model turbine were simulated through unsteady simulations using shear stress transport (SST) k–ω turbulence model. The numerical results reveal there is larger hysteresis loop increasing decreasing directions compared with results. Detailed discussions carried out to determine generation mechanism...
Pump turbines play a quite important role of peak-valley shifting in the grid, and hump margin is critical criterion related to safety stability operation pump mode. Aiming at investigating influence runner outlet setting angle distribution on performance turbine, three runners with different linear distributions were proposed, corresponding comparison was analyzed numerically through SST k-ω turbulent model. The numerical result shows that, compared experiment, relative errors all simulated...
The correlative mechanism between the flow loss and vortex evolution involves efficiency stability of space operations during fuel transportation in on-orbit refueling circulation systems. This study described detailed hydraulic characteristic vorticity by adopting entropy wall function local rate method that included dissipation effects. Combined with correlation analysis, characterized parameters distributions dissipated transported were compared based on enstrophy rigid transport...
Pressure fluctuations caused by helical vortex rope in the draft tube is one of main reasons for instability Francis turbines. Previous studies showed that drilling holes on runner cone can reduce amplitude pressure fluctuation. In this study, based which has been drilled hole, two kinds new cones are designed means more (2 cone) and a slot 1 cone). fluctuation flow pattern observation experiments as well numerical simulations at partial load operation condition turbine were carried out...
Abstract Hydraulic loss and vortex analysis are two most widely-used methods investigating flow characteristics from macroscopic view microscopic respectively although the correlation between these still not fully clarified. Based on kinetic energy equation Boussinesq hypothesis, hydraulic is resulted joint work of dissipation transportation in domain while vorticity can be further divided into local rigid rotational part deformational with help newly proposed concept Liutex. Thereafter,...
Pumped storage power plants are doomed to play a more important role in peak-valley shifting hence the demand for operation stability is gradually regarded as an equal criterion high efficiency. In our paper, new concepts, namely “swept,” “bowed (lean),” and “twisted” introduced systematic innovative design geometry of high-pressure side (HPS) pump-turbine runner. Thereafter, multi-objective optimization process, which consists experiment (DoE), meta model generation, genetic algorithm...
Abstract The relationship between entropy production and vortex evolution involves the efficiency stability of rotating machinery. This study investigates energy characteristics a rocket turbopump, revealing correlated mechanisms rate using dissipation effects characteristic evolution. Direct turbulent dissipations rigid shear vorticity decomposition methods are utilized to analyze correlation analysis flow loss vorticities in machinery for first time. With an increase rate, hydraulic wall...
Abstract High pressure side, as the runner outlet at pump mode and inlet turbine mode, playing an important role in controlling hydraulic loss flow characteristics vaneless region, affecting both steady unsteady characteristics. While when it comes to three-dimensional inverse design of a pump-turbine blade, scholars are forces on method channel, ignoring geometry profile high-pressure side. Hence, present paper, concepts “swept”, “bowed (lean)” “twisted” innovatively introduced, eight new...