Numerical Simulation of Gas-Solid Two Phase Flow in Fouled Axial Flow Compressor

Abstract

Particles contained in air can deposit on the blade surface to cause fouling when lubricating oil and water steam are existed. Fouling changes blade geometry and blade surface roughness is increased, thus aerodynamic performance is affected. Many researchers simulated axial flow compressor fouling by adding constant surface roughness and modifying blade thickness which can’t reflect the real status of fouled compressor. In this paper, reverse technology is introduced to reconstruct the solid model of fouled compressor which is imported into fluid flow simulation software. The flow of gas phase and gas-solid coupling phase are implemented to reveal the nature of flow in fouled axial flow compressor. Based on Euler-Lagrange model, this paper made numerical simulation of gas-solid two phase flow in the axial flow compressor rotor cascade. Simulation result shows that fouling causes the decrease of effective flow area, thus thermodynamic performance is degraded. Gas-solid phase flow shows that particles are not uniformly deposited on the blade surface. When particle is smaller and rotor blade is rough, it is more easily deposited on the surface. And particle mass concentration is affected by ambient conditions such as inlet temperature, rotational speed, particle diameter, particle mass flow rate.

A Compressor Fouling Review Based on an Historical Survey of ASME Turbo Expo Papers

“…It provides a method to directly compare different filter system options based on: (i) initial cost, (ii) maintenance cost, (iii) cost due to the gas turbine power loss and heat rate increase, (iv) failure, (v) availability and reliability, and (vi) the overall gas turbine degradation. 864 on compressor performance are not reported here, but are high-865 lighted in some studies and analyses [146][147][148][149][150][151][152][153][154][155][156]. Meher-Homji 866 et al [4] reported some examples of compressor deposits exempli-867 fied in Fig.…”

Numerical simulation of the fine kinetics of dust reduction using high-speed aerosols

“…To determine the kinematic interface, two transport equations [22], Eqs (1) and ( 2), which include the phase field variable φ, the mixing energy density ψ, the surface tension coefficient σ, and the interface thickness parameter ε pf , must be solved:…”

Quantitative computational fluid dynamic analyses of oil droplets deposition on vaneless diffusor walls of a centrifugal compressor

“…The research indicated that fouling may cause a drop in airflow, pressure ratio, compressor efficiency, and compressor performance, resulting in a “rematching” between the gas turbine and compressor, and a subsequent drop in power output and thermal efficiency . The fouling phenomenon in the compressor was caused by many factors, such as the number of particles, particle diameters, particle mass concentration, patterns of particle distribution, and particle mass flow rate . Meanwhile, the design parameters of the axial compressor also influenced the process of fouling formation, such as axial compressor chord length, solidity, roughness, and the number of stages .…”

“…Meanwhile, the design parameters of the axial compressor also influenced the process of fouling formation, such as axial compressor chord length, solidity, roughness, and the number of stages . In addition, studies of the transport process of solid particles in an axial compressor and the kinematic characteristics of particle deposition were helpful in researching the mechanism of solid particle deposition.…”

“…22 The fouling phenomenon in the compressor was caused by many factors, such as the number of particles, particle diameters, particle mass concentration, patterns of particle distribution, and particle mass flow rate. 4,[30][31][32][33][34][35][36][37] Meanwhile, the design parameters of the axial compressor also influenced the process of fouling formation, such as axial compressor chord length, solidity, roughness, and the number of stages. 22,[30][31][32][33][36][37][38] In addition, studies of the transport process of solid particles in an axial compressor 31,32,36,37 and the kinematic characteristics of particle deposition 34,39,40 were helpful in researching the mechanism of solid particle deposition.…”