Atlas Copco China 1HK Ltd. has taken the biggest one in the Chinese compressor market shares. 1. The description of two types of screw compressor 2. The main applications of air compressor in China 3. Chinese customers' choices mainly upon air quality requirement 4. We promote oil-free compressor for customer's economy 5. Unique attraction of oil-injected compressor As we know, compressors may ...

This paper presents an optimization tool used for the design of turbomachinery components. It is based on a metamodel assisted evolutionary approach combined with a Computer Aided Design (CAD) library for the shape generation. The analysis of the components performance is performed by Computational Solid Mechanics (CSM) and Computational Fluid Dynamics (CFD). Typical optimization problems inclu...

Stable operation of axial and centrifugal compressors is limited towards low mass 1ows due to the occurrence of surge. The stable operating region can be enlarged by active control. In this study, we use a control valve which is fully closed in the desired operating point and only opens to stabilize the system around this point. As a result, only nonnegative control values are allowed, which co...

The present work considers the modeling of turbulent flow in reed type valves of reciprocating compressors and is based on a simplified geometry of the actual valve, that is, a radial diffuser with axial feeding. Despite its simplicity the geometry chosen for the analysis has important flow features present in practical geometries. Due to its claimed capability to predict flow including feature...

In this paper we evaluate the actuator rate requirements for control of rotating stall using a bleed valve and provide tools for predicting these requirements. Modiication of both the stable and unstable parts of the compressor characteristic via addition of continuous air injection serves to reduce the requirement of a bleed valve used for the purpose of rotating stall stabilization. Analytica...

A decoupled sliding-mode neural network variable-bound control system (DSMNNVB) is proposed to control rotating stall and surge in jet engine compression systems in presence of disturbance and uncertainty. The control objective is to drive the systemstate to the original equilibriumpoint and it proves that ccepted 7 February 2010 vailable online 11 February 2010 eywords: xial compressors liding...

Local robustness of bifurcation stabilization is studied for parameterized nonlinear systems of which the linearized system possesses either a simple zero eigenvalue or a pair of imaginary eigenvalues and the bifurcated solution is unstable at the critical value of the parameter. It is assumed that the unstable mode corresponding to the critical eigenvalue of the linearized system is not linear...

John P. Elson Mgr. New Products The application of scroll compressor technology to the residential air conditioniong and heat pump markets has generated a variety of compressor design approaches to address special system requirements. This paper >till revie>t both special design needs of this application and unique scroll design concepts used to address these needs. Design concept discussions >...

In a situation where traffic, railway or aircraft noise sources are not present, as it happens in shielded areas, other sources might become relevant in terms of annoyance. This is the case of typical turbomachinery elements, such as fans, compressors or turbines, where sound is generated aerodynamically. As a part of the Sonorus project, where all noise sources in urban environments are consid...

To explain the effect of tip leakage flow on performance an axial-flow transonic compressor, compressors with different rotor clearances were studied numerically. The results show that as clearance increases, intensity is increased, shock wave position moved backward, and interaction between vortex intensified, while boundary layer weakened. Most all, stall mechanisms varying are different. mai...