设计机构各设计阶段投资预算价值的统计

正确地确定建筑预算价值,是节约国家投入基本建设方面资金的主要方向之一.这项工作应由设计机构来负责,设计机构应遵照各种规程、预算定额及其他法规正确地并以最大限度节约资金的办法来确定建筑预算价值.大家都知道,设计是分为二个或三个阶段进行的,建筑的预算价值也是这样确定的.

On the nature of tip clearance flow in subsonic centrifugal impellers

Increasing demand for downsizing of engines to improve CO2 emissions has resulted in renewed efforts to improve the efficiency and expend the stable operating range of the centrifugal compressors used in petro-chemical equipment and turbochargers. The losses in these compressors are dominated by tip clearance flow. In this paper, the tip clearance flow in the subsonic impeller is numerically investigated. The nature of the tip clearance in inducer, axial to radial bend and exducer are studied in detail at design and off-design conditions by examining the detailed flow field through the clearance and the interaction of the clearance flow with the shear effect with the endwalls. The correlation between blade loading and span wise geometry and clearance flow at different locations are presented.

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