...Francesco Melino; Mirko Morini; Antonio Peretto; Michele Pinelli; Pier Ruggero Spina Gas turbine axial compressor performance is heavily influenced by blade fouling. As a result, the gas turbines efficiency and producible power output decrease. Performance degradation of an axial compressor stage...

...Luis San Andrés; Adolfo Delgado Oil seals in centrifugal compressors reduce leakage of the process gas into the support bearings and ambient. Under certain operating conditions of speed and pressure, oil seals lock, becoming a source of hydrodynamic instability due to excessively large cross...

...-stage gas reinjection compressor is estimated for the four bearings, using a full KC representation, the KCM representation, and synchronously reduced bearing coefficients. The full KC representation gave the lowest estimate of stability margin, with up to 18% difference between full KC and KCM and up...

... the typical seal types used in process gas centrifugal compressors at the balance piston location or center seal location to limit internal leakage and ensure a robust rotordynamic design. Tests were conducted on 170.6 mm (6.716 in) diameter seals for rotor speeds up to 15 kprm, inlet air pressure of 6.9 bar...

...Wei Xu; Tong Wang; Chuangang Gu; Liang Ding The holed casing treatment is a new type of casing treatment that has self-adaptability for a centrifugal compressor with unshrouded impeller. It was demonstrated experimentally and numerically that both the stall margin and the choked margin...

...Alessandro Bianchini; Giovanni Ferrara; Lorenzo Ferrari; Valeria Ballarini; Lorenzo Bianchi; Libero Tapinassi; Lorenzo Toni A wide-ranging analysis was performed by GE Oil & Gas and the University of Florence to investigate the effects on the estimation of centrifugal compressor performance...

...Naohiko Takahashi; Yohei Magara; Mitsuhiro Narita; Haruo Miura Since heavier gases exert larger effects on rotordynamic stability, stability evaluation is important in developing or designing high-pressure compressors. To evaluate the rotor stability during operation, an excitation test using...

... analysis with dynamic force coefficients derived from the analysis of the GFBs. The developed oil-free TC was designed using a hollow rotor with a radial turbine at one end and a compressor wheel at the other end, a center housing with journal and thrust GFBs, and turbine and compressor casings...

...Rainer Kurz; Klaus Brun Fouling of compressor blades is an important mechanism leading to performance deterioration in gas turbines over time. Fouling is caused by the adherence of particles to airfoils and annulus surfaces. Particles that cause fouling are typically smaller than 2 to 10 microns...

...Alexander Lange; Matthias Voigt; Konrad Vogeler; Henner Schrapp; Erik Johann; Volker Gümmer This paper introduces an approach for considering manufacturing variability leading to a nonaxisymmetric blading in the computational fluid dynamics simulation of a high-pressure compressor stage. A set...

.... The rotor modeled corresponds to an industrial compressor. Special emphasis is put on analyzing the stability map of the rotor when the different lubrication regimes are included into the TPJB modeling. Results show that, for the studied rotor, the inclusion of a THD model is more relevant when compared...

... or coalescing and draining out (i.e., fogging efficiency), and (b) quantifying the amount of nonevaporated droplets that may reach the compressor bellmouth to ascertain the erosion risk for compressor airfoils if wet compression is to be avoided. When the silencer is installed, there is an additional...

...Yuan Liu; Manuj Dhingra; J. V. R. Prasad This paper presents a method for estimating compressor stall margin and the results of applying the estimation technique to an axial compressor rig. Stall margin estimation is accomplished through the use of a compressor stability detection parameter called...

... single as well as concurrent permanent faults in the engine. A set of nonlinear models of the jet engine in which compressor and turbine maps are used for performance calculations corresponding to various operating modes of the engine (namely, healthy and different fault modes) is obtained. Using...

... capability of the sparse estimator. In particular, the constraints help resolve a confusion issue between high pressure compressor and variable stator vanes faults. 08 04 2011 09 04 2011 01 09 2011 01 09 2011 compressors condition monitoring electrical accidents fault diagnosis...

...K. K. Botros Nozzle type check valves are often employed in compressor stations in three locations: compressor outlet, station discharge, and station bypass. The fundamental design concept of these valves is based on creating a converging diverging flow through the valve internal geometry...

...K. K. Botros Compression systems are designed and operated in a manner to eliminate or minimize the potential for surge, which is a dynamic instability that is very detrimental to the integrity of the compressor unit. Compressor surge can occur when compressors are subjected to rapid transients...

... 2011 accelerometers ball bearings compressors fuel systems rotors turbines wheels turbocharger rotor dynamics ball bearings dynamic model experimental test rig Turbochargers have commonly been equipped with journal bearings to support the turbines and rotor assembly...

...-term operational integrity of gas turbines should be evaluated carefully; in particular, wet compression may lead to the erosion of first compressor stages due to the impact of water droplets within the flow at compressor intake. This issue is still controversial in technical literature since only...

... at the calculated Helmholtz frequency of the holes. 16 08 2010 03 09 2010 19 04 2011 19 04 2011 compressors flow friction plates (structures) rotors stators surface roughness test facilities Annular seals using a smooth rotor and a hole-pattern (HP) stator are commonly...