Structural design optimization for the centrifugal pumps is a promising way achieving configurations with high mechanical efficiency and stability, but accurate synthetical loss assessment of pump has been great challenge during this process. The aim work to develop models methods hydraulic pump. First, an platform established based on Synthetical Loss Assessment (SLA) model, which consists parametric modelling, computation efficiency, validation CFD numerical simulation, as well intelligent...

A new photocatalyst of Bi/BiOI/Carbon quantum dots (CQDs) was synthesized via a simple method. Photocatalytic performance Bi/BiOI/CQDs evaluated by photodegradation RhB. Experiment indicated that the introduction CQDs could improve photocatalysis activity BiOI obviously. Moreover, there is optimum percentage CQDs. In this photocatalytic system, enhanced photoactivity mainly attributed to heterojunction interface between and BiOI, as well light harvesting for appropriate introduction. The...

Ensuring the smooth operation of rolling bearings requires a precise fault diagnosis. Particularly, identifying types under varying working conditions holds significant importance in practical engineering. Thus, we propose reinforcement ensemble method for diagnosing bearing faults conditions. Firstly, model was designed to select optimal base learner. Stratified random sampling used extract four datasets from raw training data. The trained by these datasets, respectively, and obtained...

Geometric machining errors in the blade profile and variable operating conditions extreme environment are primary factors leading to uncertainties pump performance. This paper presents an analysis of fuel centrifugal pumps by modeling geometry uncertainty based on Karhunen–Loève (KL) expansion using a polynomial chaos (PCE) model. First, geometric is described KL three sections stochastic simulation performed. Then, PCE surrogate model trained least angle regression method validated...

Global sensitivity analysis plays an important role in robustness optimization design of aero-engine fuel gear pumps to investigate how input parameters uncertainties contribute performances uncertainties. In this paper, inspired by the Leave-One-Out method, advanced Polynomial Chaos Expansion (PCE) method equipped with Adaptive both training Points and polynomial Order, denoted as APO-PCE, is proposed efficiently estimate variance-based indices. A novel active learning strategy developed...

This paper aims to tackle the calculation efficiency problem raised in cavitation-flow simulation of aviation centrifugal pump due fading-away interface resulting from dissipation numerics used phase-change control equation for unstructured-grid multiphase flow, and limitation flow time-step whole regimes, vapor-liquid two-phase considering cavitation mass transport is established firstly, modifying momentum by introducing surface tension, adding artificial convective phase solve numerical...

Objective. The aim of this study is to assess the relationship between T-lymphocyte subsets, regulatory T cells (Treg), and hepatic fibrosis in patients with a nonalcoholic fatty liver disease (NAFLD). Methods. A retrospective analysis was conducted on 64 NAFLD (research group) 73 healthy subjects (control our hospital from January 2020 December 2021. subsets (Th17) Treg, function (alanine aminotransferase (ALT), aspartate (AST)), indexes (type III procollagen (PCIII), type IV collagen...

For hybrid reliability analysis under random and multi-super-ellipsoidal variables (HRA-RM) with small failure probability, a combination of kriging subset simulation importance sampling (SSIS) was proposed in this paper. Firstly, to quantify epistemic uncertainties more accurately, the super-ellipsoidal model used replace interval/ellipsoid ones. Besides, real performance function replaced by metamodel, which can be updated sequentially selecting candidate samples from first last levels...

Purpose The purpose of this paper is to improve the hydraulic efficiency without changing overall dimension. blade profile optimization design aero-centrifugal pump based on biharmonic equation surrogate model has been studied. Design/methodology/approach First all, Bezier curves and linear function are used control annular angle distribution stacking under MATLAB platform. Grid independence analysis studied find finest mesh scheme. After precision comparison test data computation fluid...

The problems of oil trapping in aircraft engines fuel gear pump is related to low volumetric efficiency, large flow pulsation, pressure fluctuation, cavitation and other serious hazards. Aiming at this problem, paper gives a new design method unloading groove engine by establishing the calculation model trapped volume, then internal field modeled simulated. results show that designed can significantly reduce maximum fluctuation rate, effectively alleviate problem pump.