The Exploration of Bypass Matching Limitation and Mechanisms in a Double Bypass Engine Compression System

2021 ◽  
pp. 107225
Author(s):  
Ruoyu Wang ◽  
Baojie Liu ◽  
Xianjun Yu ◽  
Guangfeng An
Keyword(s):  
Compression System

scholarly journals Demonstration of a cavity-based pulse compression system for pulse shape correction

2019 ◽  
Vol 22 (8) ◽  
Author(s):  
Yuliang Jiang ◽  
Hao Zha ◽  
Ping Wang ◽  
Jiaru Shi ◽  
Huaibi Chen ◽  
...  
Keyword(s):  
Pulse Shape ◽  
Pulse Compression ◽  
Compression System ◽  
Shape Correction

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.

A code compression system based on pipelined interpreters

1999 ◽  
Vol 29 (11) ◽  
pp. 1005-1023 ◽  
Author(s):  
Jan Hoogerbrugge ◽  
Lex Augusteijn ◽  
Jeroen Trum ◽  
Rik van de Wiel
Keyword(s):  
Compression System ◽  
Code Compression

scholarly journals Medial Closed Wedge Distal Femoral Osteotomy Using a Novel Plate With an Optimal Compression System

2021 ◽  
Author(s):  
Ryuichi Nakamura ◽  
Takenori Akiyama ◽  
Ryohei Takeuchi ◽  
Hiroshi Nakayama ◽  
Eiji Kondo
Keyword(s):  
Femoral Osteotomy ◽  
Distal Femoral Osteotomy ◽  
Compression System ◽  
Closed Wedge

Low Order Modeling for Fan and Outlet Guide Vanes in Aero-Engines

2019 ◽  
Vol 141 (3) ◽  
Author(s):  
Jiahuan Cui ◽  
Rob Watson ◽  
Yunfei Ma ◽  
Paul Tucker
Keyword(s):  
Detailed Analysis ◽  
Immersed Boundary Method ◽  
Low Cost ◽  
Immersed Boundary ◽  
Test Case ◽  
Guide Vanes ◽  
Compression System ◽  
Aero Engine ◽  
Aero Engines ◽  
Low Order

Intakes of reduced length have been proposed with the aim of producing aero-engines with higher efficiency and reduced weight. As the intake length decreases, it is expected that stronger effects of the fan on the flow over the intake lip will be seen. If the effects of the fan cannot be ignored, a low-cost but still accurate fan model is of great importance for designing a short-intake. In this paper, a low order rotor/stator model, the immersed boundary method with smeared geometry (IBMSG), has been further developed and validated on a rig test case. The improved IBMSG is more robust than the original. The rig test case used for validation features a low-pressure compression system with a nonaxisymmetric inflow, which is representative of the inlet condition of an aero-engine at its cruise condition. Both the fan and the outlet guide vanes (OGVs) are modeled using IBMSG. A detailed analysis is carried out on the flow both upstream and downstream of the fan. After validating the IBMSG method against the rig test case, a short-intake case, coupled with a fan designed for the next generation of aero-engines, is further investigated. It is found that compared with the intake-alone case, the inflow distortion at the fan face is significantly reduced by the presence of fan. Due to this increased interaction between the fan and the flow over the intake lip, accounting for the effects of the downstream fan is shown to be essential when designing a short intake.

An encryption-then-compression system for JPEG standard

2015 ◽  
Author(s):  
Kenta Kurihara ◽  
Sayaka Shiota ◽  
Hitoshi Kiya
Keyword(s):  
Compression System
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