The realistic simulation of refrigerant compressors for heat pump applications is difficult because the needed physical parameters like clearance volume, blow-by, valve losses, polytropic coefficient(s), ohmic and core losses, jacket losses, etc. are not readily available. We have developed a simple yet very effective approach to this problem for our HFROST heat pump simulation program, which o...

Nowadays, with the increase of thrust-to-weight ratio aero engines, high aerodynamic load has made corner separation an issue for axial compressors. The complex three-dimensional flow field makes it challenging to suppress separation, especially considering performance at multi-working conditions. To and reduce loss, investigation in this paper proposed a new parametric suction side profiling m...

In a compressor the existence of the clearance volume is inevitable, even rolling piston compressor is a kind of compact structure compressor, overflow is a method to decrease the effect of clearance volume. In this paper, the overflow design on a rolling piston rotary compressor is discussed, which uses the high-pressure gas in the clearance volume, and discuss its effect on the performance of...

We report the rst studies of bunch length in collision in an operating linear collider, making use of a new rf bunch length monitor installed in the South Final Focus of the Stanford Linear Collider (SLC) prior to the 1997/98 luminosity run. The theoretical and measured monitor responses to linac injection phase and bunch compressor voltage are described. Correlations with beamstrahlung and lum...

The constraints on the quantizer model are usually related to how complex the model can be designed and implemented. For the given bit rate, it is desirable to provide the highest possible signal to quantization noise ratio (SQNR) with reasonable complexity of a quantizer model. In order to avoid the influence of compressor function nonlinearity and the difficulties appearing in implementing an...

We present a lossless compressor for multispectral Landsat images that exploits interband and intraband correlations. The compressor operates on blocks of 256× 256 pixels, and performs two kinds of predictions. For bands 1, 2, 3, 4, 5, 6.2 and 7, the compressor performs an integer-to-integer wavelet transform, which is applied to each block separately. The wavelet coefficients that have not yet...

Basic thermofluid processes of a positive displacement compressor are strongly dependent upon the acoustic behavior of the manifolds. Hence manifold tuning is very important so as to increase flow capacity while reducing energy consumption and fluidborne noise; recently we developed a computer simulation program used to examine the tuning phenomena analytically. However, such numerical predicti...