The process of wet compression in an axial compressor is intricate two-phase flow involving not only heat and mass transfer processes but also droplet breakup even formation discontinuous water film on the blade surface then breaking into droplets. In this paper, droplet-wall interactions are analyzed using theory spray wall impingement through two computational models for isolated transonic rotor (NASA 37). Model 1, representing spread phenomenon, assumes that all droplets impacting trapped...

The rotor blade tip leakage flow and associated formation of the vortex interaction with shockwave, particularly in case a transonic compressor have significant impact on performance its stability. Air injection upstream has been shown to improve enhance air required for is generally taken from later stages thus causing penalty gas turbine performance. In this study, effects water at without wet compression stability examined. To achieve stated objectives, well tested stage, NASA stage 37,...

The inlet fogging effects on the stable range of a NASA transonic compressor stage, Stage 35, are numerically simulated and analyzed in this paper. 3D two-phase flow fields stage investigated under different operating conditions with varying levels injected water rates droplets sizes. special attention is given to stall choking points investigate changes as result wet compression conditions. preliminary results indicate that has either and/or range. change depends rate diameters.

In this paper, wet compression effect on an eight-stage axial subsonic compressor is simulated by steady numerical methods. Special attention paid to the design operating condition and rotating stall boundary contrast analyze changes, such as performance flow-field characteristics under dry conditions. The motions of water droplets are also analyzed. results indicate that could weaken or eliminate flow separation; improve capacity, efficiency, pressure ratio compressor; make near enter into...

Sentinel lymph node (SLN) status is closely related to axillary metastasis in breast cancer. However, SLN biopsy has certain limitations due invasiveness and diagnostic efficiency. This study aimed develop a model predict the risk of early-stage cancer based on mammography, noninvasive, cost-effective, potential complementary way. Herein, 649 patients with (cT1-T2) who received were assigned training cohort (n = 487) validation 162). A prediction specific characteristics tumor mass...

The inlet fogging effects on the stable range of a NASA transonic compressor stage, Stage 35, are numerically simulated and analyzed in this paper. 3-D two-phase flow fields stage investigated under different operating conditions with varying levels injected water rates droplets sizes. special attention is given to stall choking points investigate changes as result wet compression conditions. preliminary results indicate that has either and/or range. change depends flowrate diameters.

Generally, droplets are injected into air at inlet or interstage of a compressor. However, both cases did not consider how to utilize the kinetic energy these moving droplets. Under adverse pressure gradient compressor, lower fluids blade surfaces and endwalls boundary layers would accumulate separate. Kinetic could accelerate eliminate separation. This paper mainly investigate effective positions where inject water droplets’ energy. Four different injecting positions, which located on...

The process of wet compression in an axial compressor is intricate two-phase flow involving not only heat and mass transfer processes but also droplet breakup even formation discontinuous water film on the blade surface then breaking into droplets. implementation practical boundary conditions for droplets key to proper numerical simulation process. In this paper, droplets-wall interactions are analyzed using theory spray wall impingement through two computational models isolated transonic...

Aero-engine compressor is seriously threatened by the ingestion of liquid water. This article aims to deeply study influences different water contents and droplet diameters on unsteady performance thermodynamic parameters through frequency spectrum analysis. The accuracy numerical calculation for verified experimental data. Results show that compression will be reduced fluctuations inside aggravated after ingestion. For some important parameters, such as mass flow rate, total pressure...

This paper presents numerical simulations of the effects water ingestion in axial flow compressor. A self-compiled droplet-wall interaction model is used to study impingement droplets and film fragmenting process on surfaces compressor blades, which also included splashing effects. The blade profile has been divided into small regions effectively apply rough wall capture film-related losses, shown characteristics with better accuracy. formation film, its shedding, size, movement after...

A three-dimensional (3D) Pressure Controlled Vortex Design (PCVD) method for turbine stage design is proposed and discussed in this paper. The concept developed from conventional (CVD) via pressure control approach CVD technology. By specifying the static axial velocity distributions, spanwise gradient incorporated with streamwise azimuthal directions moderated. Not only can profile loss profit approach, but also secondary flow be managed. reasons are derived stream surface thickness twist....

Abstract Two-phase flow CFD simulations are conducted to investigate the performance characteristics of an axial compressor operating under excessive amount water intrusion exposed a rainy atmosphere. In order obtain certain behavior film irregularities, blade surfaces divided into small number regions depending on thickness. addition, examine droplets interaction with rotating blades and splashing process, self-compiled FORTRAN code has been used. The results showed that uneven roughening...

Abstract For an aero turbo-shaft engine, rain water enters the intake protection device and morphology of droplets after hitting wall will affect internal flow compressor. In this paper, Sommerfeld number was used to determine shape they hit wall. The field characteristics compressor with inlet particle separator under different ingestion conditions were studied considering impact film splashing near results show that entry deteriorates compression component, affects state airflow Compared...

An aeroengine must be able to work safely under severe weather such as rainy weather. The intake of excessive rainwater into the can induce stall and surge in compressor, performance changes compressor after water ingestion directly affect reliability aeroengine. form spatial distribution at inlet is one important factors causing its changes, characteristic droplets may lead occurrence flow distortions inside compressor. Therefore, this paper takes droplet starting point uses full-flow CFD...