Mechanical analysis of key components and machine performance for the oil regeneration project compressor
Special scroll profiles among the functional general scroll profiles were chosen to make a study on the integrative performance of the scroll compressor. Based on such profiles, it was further researched for all factors working on the integrative performance of the scroll compressor and the analysis of gas power was made on the key components influencing the integrative performance and four basic parameters including height, spindle rotation, involute angle and radius parameter of base circle. It was analyzed that the relation of axial gas power, radial gas power tangential gas power, overturning torque and rotation torque of dynamic and static vortex plate by employing the Genetic Algorithms (GA) of MATLAB to obtain the restricted parameter range, and to conclude that there is a linear relationship among four basic parameters and the overall force. Instance calculation was conducted to prove the validity of the restricted range that compression ratio and volume utilization have been increased greatly after optimization, so as to avoid the blindness of parameter selection and consequently improve the integrative performance of the scroll compressor.
Summarization Analysis and Development Tendency of General Profiles for Scroll Compressor
The scroll compressor is an ingenious machine used for compressing air or refrigerant, which was originally invented in 1905 by Creux, and it was not until the 1970s that commercial interest in the idea was revived. By specifying not parameterizations of the curve, but instead the radius of curvature as a function of tangent direction and using the intrinsic equation of a planar curve, the design can be changed in a way that allows all relevant geometrical quantities to be calculated in closed analytical form. Study of scroll profiles theory at present mainly is aiming at the single profile and its ameliorate or parameter optimization, not aiming at the nature characteristic of the profiles-equation of scroll profiles itself. Summarization analysis of scroll profiles geometry theory and conjugation functional scroll profiles were given. Development tendency was aimed at the study of general theory of scroll profiles which was based on engagement of conjugate curve and variational containment of pockets. Using the theory of functional analysis, the unified general functional equation of scrolls can be formed, based on the integration of all available mathematical models of scrolls. And the unified general equation can represent any probable scrolls. The conjugation characteristics of scrolls general functional equation and compressed mechanization of medium can be studied. Taking ratio of energy and efficiency as evaluation index, heat behavior analysis as physical foundation, general functional extremal mathematical model of scrolls can be given. The general scroll profiles can be optimized and the optimization scroll profiles can be gained
Resonant Auger decay study of C1s -> pi* core-excited OCS
The present work aims at characterizing short-lived C1s((-1)) pi*((1)) core-excited states of the OCS molecule based on the analysis of the vibrational fine structure and lineshape profiles of the high-resolution resonant Auger decay spectra recorded at the excitation energies along the C1s -> pi* resonance in the binding energy region 15-19eV. Very different behavior in terms of lineshape and resonant enhancement is observed for the (A) over tilde, (B) over tilde and (C) over tilde final states. This is explained by (1) the variation in the C-O bond lengths for the states involved in the electronic relaxation and (2) different contributions in terms of Mulliken population to the molecular orbitals determining the electronic character of the corresponding states. Since the final-state geometries are known from a number of previous experiments and ab initio calculations, the geometry of the C1s((-1)) pi*((1)) intermediate states can be predicted in analogy with e.g. the N-2, CO2 and N2O molecules. (C) 2009 Elsevier B.V. All rights reserved. (Less)