Centrifugal Compressor Test Bench with Temperature Simulator
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Solution Overview
Problem
Existing centrifugal compressor test benches are unable to accurately reproduce the aerodynamic characteristics and internal flow field of turbochargers during transitional states under variable engine conditions, as they primarily focus on steady-state performance and neglect heat transfer processes.
Innovation Solution
A test bench device that includes a centrifugal compressor, a turbine back disk temperature simulator, a speed regulator, and a rotating speed feedback control system, allowing for accurate control of rotating speed and temperature distribution to simulate the effects of radiation heat transfer during variable speed operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional aerodynamic test benches focus on internal flow and aerodynamic characteristics, then measurement of pressure ratio, efficiency, and flow rate is achieved, but heat transfer process between compressor and airflow is neglected
Solution Approach 1:
The test bench is designed to perform multiple functions: it can measure both aerodynamic characteristics (pressure ratio, efficiency, flow rate) and heat transfer processes simultaneously. The system integrates aerodynamic sensors and temperature measurement devices to provide comprehensive testing capabilities for centrifugal compressors under variable working conditions.
Solution Approach 2:
The test bench is specifically designed to test the centrifugal compressor under variable rotational speed conditions rather than steady-state only. The speed regulator and feedback control system enable dynamic operation, allowing the system to capture transient heat transfer processes and aerodynamic characteristics during speed transitions, making the test bench adaptable to real engine operating conditions.
2Stability of the object's composition
If constant rotational speed testing is used, then steady-state performance data is obtained, but transient characteristics during speed switching are not captured
Solution Approach 1:
The test bench transitions from steady-state testing to dynamic testing by incorporating a speed regulator and feedback control system. This allows the centrifugal compressor to operate under variable rotational speeds, capturing transient characteristics during speed switching while maintaining controlled test conditions. The system can now evaluate both steady-state and transient performance.
Solution Approach 2:
The feedback control system预先 (in advance) regulates the rotational speed according to predetermined profiles, enabling the test bench to systematically capture transient characteristics before they occur naturally. This preliminary control ensures that transient states are properly recorded for analysis.
3Device complexity
If turbine back disk temperature effects are not simulated, then test setup is simplified, but actual engine operating conditions are not reproduced
Solution Approach 1:
A turbine back disk temperature simulator is introduced as an intermediary component between the centrifugal compressor and the test environment. This simulator reproduces the thermal effects of the turbine back disk on the compressor inlet airflow, accurately reproducing actual engine operating conditions without requiring the complete turbocharger assembly.
Solution Approach 2:
The test bench controls and varies the temperature parameter of the back disk simulator to match different engine operating conditions. By adjusting the temperature parameter, the system accurately reproduces the thermal effects experienced in real engine applications, enhancing simulation reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The test bench effectively reproduces the typical characteristics of internal flow heat transfer and dynamic performance of centrifugal compressors during variable rotating speed conditions, providing a more realistic and comprehensive evaluation of turbocharger performance.
Implementation Method 1
a thermocouple array is composed of a plurality of pairs of thermocouples, and the thermocouple array is arranged on a surface of the back plate
Implementation Method 2
a back plate and the heat exchanger are arranged at a front end of the turbine back disk temperature simulator
Implementation Method 3
the centrifugal compressor is sequentially arranged coaxially with a turbine back disk temperature simulator
Data Source
AI summary
A performance test bench device for a centrifugal compressor under a variable working condition of an engine is composed of: a turbine back disk temperature simulator and the centrifugal compressor being coaxially arranged, and being sequentially connected with a speed regulator and a driver. Meanwhile, a thermocouple array is arranged on a surface of a simulator back plate. A temperature measurement probe is arranged at an inlet and an outlet of the centrifugal compressor, and a thermocouple array is also arranged on a surface of a cover plate of the centrifugal compressor and a surface of a rotating blade. An airflow passes through the inlet pipeline, the flow meter and the air inlet rectification system, is pressurized by the centrifugal compressor, and is then discharged by the outlet pipeline.