Unsteady Flow Field Measurements In An Industrial Centrifugal Compressor

  title={Unsteady Flow Field Measurements In An Industrial Centrifugal Compressor},
  author={Lorenzo Toni and Valeria Ballarini and Stefano Cioncolini and Paolo Gaetani and Giacomo Persico},
Unsteady flow field measurements of both static and total pressure, and discharge angle have been carried out downstream of an industrial centrifugal impeller. Phase-resolved measurements were performed using a cylindrical single sensor fast response aerodynamic pressure probe (FRAPP) traversing and rotating from the impeller hub up to the shroud. Since FRAPP operates as a virtual three-hole probe, it was possible to obtain a detailed bidimensional reconstruction of the flow field. An… 

Prediction and Validation of High-Performance Centrifugal Compressor Impeller Forced Response

This paper focuses on the forced response analysis of an unshrouded high-speed centrifugal impeller incorporating aircraft engine technology designed for hydrocarbon processing, and follows a rigorous numerical approach supported by validation against dedicated aeromechanic test data.

The Impact of Inlet Distortion and Reduced Frequency on the Performance of Centrifugal Compressors

This paper discusses the impact of inlet flow distortions on centrifugal compressors based upon a large experimental data base in which the performance of several impellers in a range of corrected

Towards Centrifugal Compressor Stages Virtual Testing

Flow features inside centrifugal compressor stages are very complicated to simulate with numerical tools due to the highly complex geometry and varying gas conditions all across the machine. For this


The Oil & Gas industry is looking with increased interest at solutions for improving operating flexibility of centrifugal compressors. The stable operation of a compressor stage or machine is

Analysis Of The Rotordynamic Response Of A Centrifugal Compressor Subject To Aerodynamic Loads Due To Rotating Stall

In the current industrial research on centrifugal compressors, manufacturers are showing increasing interest in the extension of the minimum stable flow limit in order to improve the operability of

Numerical investigation of the lean effects in centrifugal compressors

  • F. MerliG. Paolo
  • Engineering
    13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics
  • 2019
A numerical analysis of opposite lean angles on the rotor blades is carried out and shows a weak dependence of the rotor efficiency on rotor blade lean; notwithstanding, the local flow field at the rotor outlet presents different patterns that affect the flow evolution in the vaneless diffuser and its performances.

Accurate Radial Vaneless Diffuser One-Dimensional Model

A simplified one-dimensional model for the performance estimation of vaneless radial diffusers is presented. The starting point of such a model is that angular momentum losses occurring in vaneless

Effects Due to the Temperature Measurement Section on the Performance Estimation of a Centrifugal Compressor Stage

A wide-ranging analysis was performed by GE Oil & Gas and the University of Florence to investigate the effects on the estimation of centrifugal compressor performance induced by a different choice

A Systematic Approach to Estimate the Impact of the Aerodynamic Force Induced by Rotating Stall in a Vaneless Diffuser on the Rotordynamic Behavior of Centrifugal Compressors

One of the main challenges of the present industrial research on centrifugal compressors is the need of extending the left margin of the operating range of the machines. As a result, interest is

Technology Development of Fast-Response Aerodynamic Pressure Probes

A novel procedure for the quantification of the measurement uncertainty, recently developed and based on the Montecarlo methodology, is introduced and discussed in the paper.



Three Dimensional Clocking Effects in a One and a Half Stage Transonic Turbine

This paper presents an experimental investigation of the flow field in a high-pressure transonic turbine with a downstream vane row (1.5 stage machine) concerning the airfoil indexing. The objective

A Parametric Study of the Blade Row Interaction in a High Pressure Turbine Stage

An extensive experimental analysis on the subject of the unsteady periodic flow in a high subsonic high pressure (HP) turbine stage has been carried out at the Laboratorio di Fluidodinamica delle

Time-resolved flow measurements with fast-response aerodynamic probes in turbomachines

A better understanding of unsteady flow phenomena encountered in rotor-stator interactions is a key to further improvements in turbomachinery. Besides CFD methods yielding 3D flow field predictions,

Investigation of the Flow Field in a High-Pressure Turbine Stage for Two Stator-Rotor Axial Gaps—Part II: Unsteady Flow Field

An extensive experimental analysis was carried out at Politecnico di Milano on the subject of unsteady flow in high pressure (HP) turbine stages. In this paper, the unsteady flow measured downstream

A New Slip Factor Correlation for Centrifugal Impellers in a Wide Range of Flow Coefficients and Peripheral Mach Numbers

The preliminary design of new centrifugal stages often relies on one-dimensional codes implementing the concept of slip factor. This parameter plays a primary role in the stage design process since

Shock tube flows past partially opened diaphragms

Unsteady compressible flows resulting from the incomplete burst of the shock tube diaphragm are investigated both experimentally and numerically for different initial pressure ratios and opening

Experimental Characterization of Vaneless Diffuser Rotating Stall: Part V — Influence of Diffuser Geometry on Stall Inception and Performance (3rd Impeller Tested)

Vaneless diffuser rotating stall is a serious problem for centrifugal compressors, since it limits their working range. In the literature some good correlations can be found for predicting stall

Improving the Accuracy of Tests for Centrifugal Compressor Stage Performance Prediction

A design of experiment approach was used to solve problems on the new centrifugal compressor stage development test beds at the Nuovo Pignone – GE Oil&Gas premises in Florence, Italy. The company is

Influence of temperature transients and centrifugal force on fast-response pressure transducers

Abstract. This contribution focuses on the use of fast-response semi-conductor pressure transducers to measure accurately the mean and fluctuating total pressure or static pressure in a wind tunnel

Design and analysis of new concept fast-response pressure probes

Two cylindrical fast-response pressure probes for unsteady flow measurements in turbomachinery have been designed and tested. Commercially available miniaturized pressure sensors have been used to