The internal flow problem of a reversible pump turbine restricts its safe and stable operation. Among them, the influence guide vane on field is very crucial. flow–head relationship great significance in performance stability unit. In this study, characteristics under different rates were analyzed for opening angles. By comparing results model test computational fluid dynamics simulation, it wa...

This paper describes three-dimensional unsteady simulations of sand–water flow within a turbine passage. Sand abrasion movable guide vane made from ZG06Cr13Ni4Mo is tested before and after tungsten carbide spray-coating. forms medium- high-strength stainless steel castings for engineering structures. Different sand particle sizes produce different wear on the vane. For 0.4-mm sediment particles...

Forests provide potentially important bee habitat, but little research has been done on forest bee diversity and the relative effectiveness of bee sampling methods in this environment. Bee diversity and sampling methodology were studied in an Illinois, USA upland oak-hickory forest using elevated and ground-level pan traps, malaise traps, and vane traps. 854 bees and 55 bee species were collect...

A newly invented compressor, namely revolving vane compressor (RV) has been introduced two years ago (Teh and Ooi, 2006, 2006, 2006). This paper presents the improved version (Teh and Ooi, 2007) of the RV, called RV-i, where “i” stands for improved. The RV or RV-i is designed with the intention to overcome most of the limitations facing the working characteristics of the rolling piston compress...

In accordance with worldwide consensus, the use of chlorofluorocarbons, which play an important role in damaging the ozone layer, should be completely abolished by the end of 1995. This provided the impetus for developing the three vane rotary compressor. Formerly CFC-12 was used as the refrigerant in automotive air conditioners, until HFC-134a was substituted for CFC-12. In response to the cha...

The overall cooling performance of turbine nozzle guide vane, with the impingement-cutback structure, is experimentally studied in actual-scale cascade. gas high temperature used to achieve actual dynamic viscosity coefficient and density ratios. coolant-to-gas mass flow ratio (KG) varies between 0.034 0.050 gas-to-coolant (KT) 1.5 2.4. local Overall Cooling Effectiveness (OCE) on middle cross-...

The Cross Vane mechanism was recently invented and employed in the design and development of an expandercompressor unit, named Cross Vane expander-compressor or CVEC in short. This device replaces the compressor and expansion valve of a conventional vapour compression cycle, and improves the energy efficiency of the system. Theoretical models which include geometrical, thermodynamics, mass flow...

current world conditions require compressors to be both efficient and economical to manufacture. one means of improving efficiency in a rotary vane (or any) compressor is to use the lubricant as a heat transfer agent. A rotary vane refrigerator compressor was modified and instrumented for calorimeter testing so that the performance improvement could be identified. The changes and testing were c...

This work presents a comparison of thin film gauge (TFG) and infrared (IR) thermography measurement techniques to simultaneously determine heat transfer coefficient and film cooling effectiveness. The first comparison was with an uncooled vane where heat transfer coefficient was measured at Mex=0.77 and Tu=16%. Relatively good agreement was found between the results of the two methods and the e...