Abstract The novel inclined slashface structure is proposed based on typical perpendicular slashface. flow characteristics within different slashfaces and turbine cascade as well the interaction between endwall gap leakages are numerically analyzed. cooling blade phantom performance with designs compared. results show that mainstream ingests at a high axial velocity near leading edge ejects out before z/Cax=0.6, forming curved ingestion region. slashface, especially for α=60°, directly...

The mid-passage gap is an inevitable structure in a vane passage due to turbine vanes being manufactured individually. coolant from this able prevent hot mainstream ingression and provide cooling protection for the endwall. A novel idea of enlarging endwall's coverage area reducing thermal load by applying with variable surface angles carried out paper. aerothermal film performances under four modes at three typical mass flow ratio conditions are numerically investigated. Results indicate...

Abstract The swirling flow and the hot spot generated in aeroengine combustor have significant impacts on downstream turbine components. This paper numerically investigates influence of residual swirl clocking position, direction aero-thermal characteristics stage cascades cooling performance rotor blades. Computational results show that slightly decreases total pressure loss cascades. And negative increases by about 3–5%. blade are scarcely influenced positions. mass tip holes 2%, compared...

Landslides are a major concern in the mountainous regions of southwest China, leading to significant loss life and property damage. Therefore, it is crucial identify potential landslides for early warning mitigation. stacking-InSAR, technique used landslide identification wide area, has been found be faster than conventional time-series InSAR. However, dense vegetation China mountains an adverse impact on coherence resulting more noise inaccuracies identification. To address this problem,...

Time-resolved particle image velocimetry was applied to investigate turbulent vortex rings generated by a synthetic jet impacting porous walls. By varying the nondimensional diameter of hole (dh* = 0.067–0.20), we chose four walls with constant porosity (ϕ 75%) examine effect their geometry on this rings/porous wall interaction. In upstream flow, strength shear layer induced decreased as dh* increased, and so did radial spreading primary ring. downstream an increase in dh*, coherence...

This paper presents an experimental study on the effects of Reynolds number (Resj = 300, 600, and 900) porosity (ϕ 20%–85%) synthetic jet vortex rings impinging onto a porous wall. Laser-induced fluorescence particle image velocimetry are used to acquire flow information qualitatively quantitatively. When Resj is low 300), ϕ plays key role in determining formation transmitted downstream. For first time, row individual small-scale that form at lowest 20%) have been observed jet/porous wall...

Abstract Due to manufacturing, assembly, and operational conditions, gaps are commonly presented in the turbine components, such as platform blade-to-blade gap (slashface gap) rim cavity (slot gap). The coolant ejected through these not only limits hot mainstream gas ingestion into disk but also has potential provide endwall film cooling coverage. Nevertheless, interaction of flows, predesigned hole jets, secondary significantly impacts heat transfer performance leads a more complicated flow...

The arrangement of insulator strings has an effect on its pollution flashover characteristics. A new strings, inverted T-type arrangement, is proposed in this study. electric field distribution simulated and the characteristics are tested artificial climate chamber. test results indicate that can greatly improve voltage polluted '7 + 2' increase each by 8.5% average, '3 3' 13.4%. discharge process different from normal suspension string when T-shaped, i.e. a local arc produced at low end...

Previous studies have shown that vortex rings impinging onto porous walls will pass through the wall more easily as ring strength, porosity, and pore size increase thickness decreases. Thus, there should exist a similarity parameter formed from these factors allow determination of dynamics rings/porous interaction. To find this parameter, effects Reynolds number (309–1238) (0.07–0.20) on interaction are investigated by laser-induced fluorescence particle image velocimetry (PIV) techniques....

The objective of the present simulations is to evaluate applicability standard <TEX>$k-{\varepsilon}$</TEX> turbulence model in engineering practice subcritical supercritical flow regimes. Two-dimensional numerical around a circular cylinder at <TEX>$Re=1{\times}10^5$</TEX>, <TEX>$5{\times}10^5$</TEX> and <TEX>$1{\times}10^6$</TEX>, had been performed using Unsteady Reynolds-Averaged Navier Stokes (URANS) equations with model. Solution verification studied by evaluating grid time step size...

The turbine vane inlet downstream of the lean premixed combustor presents nonuniform distributions velocity and temperature. For obtaining swirling inflow profiles close to reality, simulated non-reacting is designed firstly. Applying these as boundary conditions, effects realistic on endwall aerothermal characteristics film cooling performance are numerically investigated through solving three-dimensional Reynolds-Averaged Navier-Stokes equations coupled with shear stress transfer...

As the switch for start-up of nozzle at rear recoilless gun, opening pressure blocking sheet directly affects balance gun during shooting process. The time is obtained through high-speed camera by capturing tail flame. Using piezoelectric sensors, different positions along barrel were measured. Furthermore, moment was determined based on its time. A significant force jump (Δ f = 146.9 kN) in unbalanced recoil experienced initial firing stage identified theory one-dimensional balanced...