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Keywords: stability
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Journal Articles
Article Type: Research-Article
J. Eng. Gas Turbines Power. August 2022, 144(8): 081009.
Paper No: GTP-22-1010
Published Online: June 20, 2022
...Leonardo Urbiola-Soto; Paolo Pennacchi This paper presents component and system-level analyses to understand the stiffness, damping, and rotor stability effects of tilting pad journal bearings (TPJB) with assembled clearance variation across pads. This variation results from a normal manufacturing...
Journal Articles
Article Type: Research-Article
J. Eng. Gas Turbines Power. September 2021, 143(9): 091024.
Paper No: GTP-20-1293
Published Online: August 9, 2021
... is built based on total potential energy. The dynamic model consists of a time-independent stiffness matrix for perfect bolts, a time-variant reductive stiffness, and an additional moment. As a result, the crack in bolt reduces rotor's nonlinear stability and leads to greater vibration and fluctuation...
Journal Articles
Article Type: Research-Article
J. Eng. Gas Turbines Power. July 2014, 136(7): 072501.
Paper No: GTP-14-1007
Published Online: February 18, 2014
... stability High speed turbochargers are intended to increase the power of internal combustion engines. For the commercial 3.9 liter diesel engine used for this research, the stock turbocharger increases the nonturbo engine power by 85%. The first turbocharger was invented in the early twentieth...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. May 2012, 134(5): 051504.
Published Online: March 1, 2012
...Andrew P. Shroll; Santosh J. Shanbhogue; Ahmed F. Ghoniem This work explores the dynamic stability characteristics of premixed CH 4 /O 2 /CO 2 mixtures in a 50 kW swirl stabilized combustor. In all cases, the methane-oxygen mixture is stoichiometric, with different dilution levels of carbon dioxide...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. May 2012, 134(5): 052501.
Published Online: February 15, 2012
... such as higher rotor-bearing stability and lower start friction compared to the single pad bearings. The preload R p in Fig. 3 is defined as the physical distance between the bearing center and the top foil pad center when the top foil is assumed to follow the ideal circular profile as attached to the bump...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. March 2012, 134(3): 032505.
Published Online: January 4, 2012
...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...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. January 2012, 134(1): 011603.
Published Online: November 7, 2011
...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...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. August 2011, 133(8): 082501.
Published Online: April 5, 2011
... with the existing nonautonomous shooting method and is thus modified; the shooting method is used to obtain a steady state quasiperiodic solution. The eigenvalues of monodromy matrix provide information about stability and nature of bifurcation of the quasiperiodic solution. The maximum value of the Lyapunov...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. February 2011, 133(2): 022502.
Published Online: October 26, 2010
... model has been developed. It leads to nonlinear differential equations of the second order, linearly coupled, in which the nonlinearity appears by cubic terms. Periodic solutions in both free and forced cases are sought by the HBM coupled with an arc length continuation and stability analysis...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. December 2010, 132(12): 121502.
Published Online: August 20, 2010
...Mirko R. Bothien; Jonas P. Moeck; Christian Oliver Paschereit Linear stability analysis by means of low-order network models is widely spread in industry and academia to predict the thermoacoustic characteristics of combustion systems. Even though a vast amount of publications on this topic exist...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. October 2010, 132(10): 102904.
Published Online: June 30, 2010
... water cooled reactors, as the density change is very large for the supercritical fluids. A computer code SUCLIN has been developed employing supercritical water properties to carry out the steady-state and linear stability analysis of a SCW natural circulation loop (SCWNCL). The conservation equations...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. May 2010, 132(5): 051602.
Published Online: March 4, 2010
...Yuan Liu; Manuj Dhingra; J. V. R. Prasad An active engine control scheme for protection against compressor instabilities such as rotating stall and surge is presented. Compressor stability detection is accomplished via a parameter known as the correlation measure, which quantifies the repeatability...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. July 2009, 131(4): 041601.
Published Online: April 14, 2009
...Yuan Liu; Manuj Dhingra; J. V. R. Prasad Active compressor stability management can play a significant role in the intelligent control of gas turbine engines. The present work utilizes a computer simulation to illustrate the potential operability benefits of compressor stability management when...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. July 2009, 131(4): 042503.
Published Online: April 10, 2009
... simulations for stability analyses, and frequency-domain modal analyses for prediction of rotor-bearing natural frequencies. Scaling analysis indicates that direct miniaturization of macroscale tilting pad gas bearing can result in a large bearing number, which may render the rotor-bearing system unstable...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. January 2009, 131(1): 012503.
Published Online: October 9, 2008
...Sébastien Le Lez; Mihaï Arghir; Jean Frêne One of the main interests of gas foil bearings lies in their superior rotordynamic characteristics compared with conventional bearings. A numerical investigation on the stability limit and on the unbalanced response of foil bearings is presented...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. November 2008, 130(6): 062505.
Published Online: August 28, 2008
... with enhanced rotordynamic stability; and when modified for hydrostatic pressurization, demonstrate superior rotordynamic performance over other bearing types. External pressurization stiffens gas bearings thus increasing system critical speeds, albeit reducing system damping. Most importantly, measurements...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. November 2008, 130(6): 062501.
Published Online: August 21, 2008
... hydrodynamics lubricating oils lubrication machine bearings reliability rotors wear airfoil bearing hydrostatic hybrid perturbation analysis stability Airfoil bearings have been successfully used in high speed microturbomachinery such as turbocharger∕generators, aircraft air cycle...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. July 2008, 130(4): 041201.
Published Online: April 28, 2008
... to counteract compressor stability problems. Especially, using recirculating bleed air for increasing the surge margin of a compressor affects the performance of the engine negatively. Two examples show clearly that the pros and cons of recirculating bleed can only be judged with a full system simulation...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. March 2008, 130(2): 022501.
Published Online: January 22, 2008
... Conference on Vibrations in Rotating Machinery , Bath, pp. 51 – 58 . 26 04 2007 08 06 2007 22 01 2008 blades discs (structures) fans sensitivity analysis stability statistics Since the major problem surrounding mistuned bladed disks is related to uncertainty...
Journal Articles
Article Type: Research Papers
J. Eng. Gas Turbines Power. January 2008, 130(1): 011510.
Published Online: January 16, 2008
... the combustor to achieve a stable operation for planned conditions, but dynamics may still occur with minor changes in ambient operating conditions or fuel composition. In these situations, pilot flames or adjustment to fuel flow splits can be used to stabilize the combustor, but often with a compromise...