The method for calculating circulating gas-dynamic forces in labyrinth seals installed between the opposite impellers of high-pressure centrifugal compressors

2021 ◽  
Author(s):  
V. A. Futin ◽  
S. S. Evgeniev
Keyword(s):  
High Pressure ◽  
Centrifugal Compressors ◽  
Labyrinth Seals ◽  
Gas Dynamic ◽  
Dynamic Forces

Numerical Characterization of Swirl Brakes for High Pressure Centrifugal Compressors

2013 ◽  
Author(s):  
Riccardo Da Soghe ◽  
Mirko Micio ◽  
Antonio Andreini ◽  
Bruno Facchini ◽  
Luca Innocenti ◽  
...  
Keyword(s):  
High Pressure ◽  
Tangential Velocity ◽  
Operating Conditions ◽  
Design Parameters ◽  
Centrifugal Compressors ◽  
Labyrinth Seals ◽  
Numerical Characterization ◽  
Lean Angle ◽  
The Stability ◽  
The Many

High pressure centrifugal compressors continue to experience vibrations due to rotordynamic stability. The main cause for aero-induced exciting forces that affects the stability, is the tangential velocity component of the gas entering the many labyrinth seals throughout the machine. In order to control or limit these swirling flows, swirl brakes are generally implemented both at the impeller eye seals and at the balance piston or division wall seal of a centrifugal compressor. This paper deals with the aerodynamic characterization, by means of CFD, of such kind of devices. Several design parameters, such as teeth lean, angle of attack and pitch-to-chord ratio have been considered and also the operating conditions (pressure level and swirl at the swirl brake inlet) are accounted for. This paper aims to improve the physical understanding of the fluid flow of centrifugal compressors swirl brakes allowing an optimization of such systems.

scholarly journals Design Method for Channel Diffusers of Centrifugal Compressors

2013 ◽  
Vol 2013 ◽  
pp. 1-7
Author(s):  
Mykola Kalinkevych ◽  
Andriy Skoryk
Keyword(s):  
Numerical Simulation ◽  
Boundary Layer ◽  
Inverse Problem ◽  
High Pressure ◽  
Gas Dynamics ◽  
Design Method ◽  
Compressor Stage ◽  
Centrifugal Compressors ◽  
Vaned Diffuser ◽  
Gas Dynamic

The design method for channel diffusers of centrifugal compressors, which is based on the solving of the inverse problem of gas dynamics, is presented in the paper. The concept of the design is to provide high pressure recovery of the diffuser by assuming the preseparation condition of the boundary layer along one of the channel surfaces. The channel diffuser was designed with the use of developed method to replace the vaned diffuser of the centrifugal compressor model stage. The numerical simulation of the diffusers was implemented by means of CFD software. Obtained gas dynamic characteristics of the designed diffuser were compared to the base vaned diffuser of the compressor stage.

Roles of vanes in diffuser on stability of centrifugal compressor

2019 ◽  
Vol 233 (14) ◽  
pp. 5380-5392
Author(s):  
Wangzhi Zou ◽  
Xiao He ◽  
Wenchao Zhang ◽  
Zitian Niu ◽  
Xinqian Zheng
Keyword(s):  
High Pressure ◽  
Centrifugal Compressor ◽  
Dynamic Pressure ◽  
Pressure Ratio ◽  
Pressure Rise ◽  
Rotating Stall ◽  
Centrifugal Compressors ◽  
Compression System ◽  
The Stability ◽  
Rotating Instability

The stability considerations of centrifugal compressors become increasingly severe with the high pressure ratios, especially in aero-engines. Diffuser is the major subcomponent of centrifugal compressor, and its performance greatly influences the stability of compressor. This paper experimentally investigates the roles of vanes in diffuser on component instability and compression system instability. High pressure ratio centrifugal compressors with and without vanes in diffuser are tested and analyzed. Rig tests are carried out to obtain the compressor performance map. Dynamic pressure measurements and relevant Fourier analysis are performed to identify complex instability phenomena in the time domain and frequency domain, including rotating instability, stall, and surge. For component instability, vanes in diffuser are capable of suppressing the emergence of rotating stall in the diffuser at full speeds, but barely affect the characteristics of rotating instability in the impeller at low and middle speeds. For compression system instability, it is shown that the use of vanes in diffuser can effectively postpone the occurrence of compression system surge at full speeds. According to the experimental results and the one-dimensional flow theory, vanes in diffuser turn the diffuser pressure rise slope more negative and thus improve the stability of compressor stage, which means lower surge mass flow rate.

Analysis of endurance of the material in the nozzle throat in high-pressure gas-dynamic facilities

2012 ◽  
Vol 53 (6) ◽  
pp. 954-960
Author(s):  
M. E. Topchiyan ◽  
V. I. Pinakov ◽  
A. A. Meshcheryakov ◽  
V. N. Rychkov
Keyword(s):  
High Pressure ◽  
Nozzle Throat ◽  
Gas Dynamic

Axial Gas-Dynamic Forces in a Compact Centrifugal Compressor

2018 ◽  
Vol 61 (1) ◽  
pp. 134-137
Author(s):  
S. S. Evgen’ev ◽  
V. A. Futin
Keyword(s):  
Centrifugal Compressor ◽  
Gas Dynamic ◽  
Dynamic Forces

A Performance Autopsy of Three Centrifugal Compressors for a Small Gas Turbine

2010 ◽  
Author(s):  
Colin Rodgers ◽  
Dan Brown
Keyword(s):  
High Pressure ◽  
Gas Turbine ◽  
Radial Flow ◽  
Pressure Ratio ◽  
Test Results ◽  
Design Features ◽  
Centrifugal Compressors ◽  
High Pressure Ratio ◽  
Flow Type ◽  
The One

Three 140mm tip diameter centrifugal compressors were designed and tested to determine the one exhibiting the best performance most suitable for eventual application to a small 60KW radial flow type gas turbine. The design features, and stage test results of these three moderately high pressure ratio impellers are presented, together with a comparison of their respective test and CFD computed performance maps.

scholarly journals The Design of Fabricated Ducts to Avoid Gas Induced High Cycle Fatigue

1997 ◽  
Author(s):  
R. Eaton ◽  
J. Platt ◽  
S. Gallimore
Keyword(s):  
High Cycle Fatigue ◽  
Cycle Fatigue ◽  
Element Analysis ◽  
Static Testing ◽  
Hot Gas ◽  
Gas Dynamic ◽  
Dynamic Forces ◽  
Fatigue Life Analysis ◽  
Engine Testing ◽  
Set Up

The design and fatigue life analysis of many fabricated sheet metal components which operate in a hot gas path environment is made uncertain by the difficulty in predicting the gas dynamic forces to which the component will be subjected. This is particularly true for ducts which are exposed to minimal static loading such as inter-turbine ducts, which have little pressure drop across them but are subjected to highly non-uniform flow from the upstream turbine exit. Finite element analysis and static testing has revealed — that certain modal frequencies respond much more significantly than others and where these coincide with gas dynamic frequencies a resonance is set up and rapid and catastrophic failure will occur. Through a combination of analysis and engine testing it has been possible to identify the damaging gas dynamics and modal frequencies. This has enabled rules to be developed which assist in the design of such ducts to avoid high cycle fatigue failure. This paper describes the development of the design process and by means of a typical example shows its application and effect on the design of an inter-turbine duct.

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