Fouling is the most important performance degradation factor, so it necessary to accurately predict effect of fouling on engine performance. In previous research, very difficult model fouled axial flow compressor. This paper develops a new calculation method multistage compressor based experiment result and operating data. For compressor, whole decomposed into two sections. The first section includes 50% stages which reflect level, second last are viewed as clean stage because less deposits....

Particles contained in air can deposit on the blade surface to cause fouling when lubricating oil and water steam are existed. Fouling changes geometry roughness is increased, thus aerodynamic performance affected. Many researchers simulated axial flow compressor by adding constant modifying thickness which can’t reflect real status of fouled compressor. In this paper, reverse technology introduced reconstruct solid model imported into fluid simulation software. The gas phase gas-solid...

In cooperative partner selection problem, many uncertain factors such as flexibility and quality affect the result. order to select optimal partner, people use AHP (analytic hierarchy process) method evaluate alternatives. The traditional canpsilat adequately deal with problem reflect fuzziness of human judgment. this paper, TFN (triangular fuzzy number) -AHP combined set theory overcome above shortcomings. It can provide relative importance all which should be considered by decision makers....

In axial flow compressor, blade surface roughness is affected by many failure modes such as fouling, erosion, corrosion and foreign object damage. But with development of filter performance, particles diameter larger than 2 &mum cannot enter into so fouling the most important influence factor which results in variation roughness. This study respectively discusses effect on performance parameter when constant linearly distributed. Finally, based experiment result, reverse design method...

Fouling is an important performance degradation factor of axial flow compressor. Proper fouling sensitive parameter crucial to more effectively monitor the severity. Currently level and cleaning necessity are judged by decrease degree thermodynamic from macro point. But simulation research NASA rotor 37 finds that tip clearance increase also causes parameters such as pressure ratio, mass flow, efficiency output power, so these can’t distinguish other failure modes. Contaminated particles...

As a method of non-traditional machining, EDM plays an important role in advanced manufacturing technology. The process involves multi-physics coupling effects such as electromagnetics, thermal and fluid. It has the characteristics instantaneity, randomness complexity, which brings difficulties to study discharge process. In this paper, model is established based on magnetohydrodynamics, simulated transiently. Results show that plasma channel formed within 0.1μs, highest current density...

In axial flow compressor, blade profile parameter is affected by many failure modes such as fouling, erosion, corrosion and foreign object damage. these modes, fouling the most important influence factor which results in variation of parameter. This paper, respectively, discusses effect surface roughness on performance when constant linearly distributed. At same time, tip clearance compressor discussed. Finally, based experiment result, reverse design method applied to reconstruct fouled...

Fouling in the compressor and turbine, from particles (such as dust, pollen, seed, insect unburned hydrocarbon) deposited on blade results change of profile, thus flow area is reduced. Many researches have demonstrated that fouling can result reduction power efficiency, increase running costs. At present, most effective control method for gas turbine off-line washing, but washing may seriously affect unit’s benefit. So, it very important to determine optimal cycle. In previous studies, many...

axial compressor is extensively used in modern gas turbine power stations. Because the effect of external contaminants and internal contaminants, particles entered are deposited blade surface to change geometry, thus thermal performance influenced. Traditional flow simulation method defines as rough wall with constant roughness. But experiment demonstrated that fouling level uniform surface, so this unable reveal nature fouling. Thus, sensitive parameter phenomenon must be replaced. New...

In order to improve the working characteristics of scroll compressor, according profile energy efficiency ratio (EER) compressor is taken as objective function, and number turns N knots are determined based on genetic annealing algorithm. The distance p, height body h, thickness t optimized. optimized solution set, three sets initial selected for theoretical calculation thermodynamic volume characteristics, specific influence parameters explored in detail, compared with unoptimized scroll....