Influence of solid particle erosion (SPE) on safety and economy of steam turbines

Cao, Lihua; Tu, Chaoyu; Hu, Pengfei; Liu, Shuang

doi:10.1016/j.applthermaleng.2018.12.172

Cited by 67 publications

(20 citation statements)

References 14 publications

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“…At present, many researchers had analyzed the vibration response of floating slab ballastless tracked in subway tunnels, but rarely compare them with other types of ballastless tracks. At the same time, the lack of consideration of the influence of the structural parameters of the floating slab ballastless track bed on the system vibration requires further research work [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of influence of different track structures on vibration response of subway

Zhou

2020

THERM SCI

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Taking Beijing metro line 5 as the research vehicle model, the influence of different track structure on subway vibration is analyzed. According to the coupling dynamic equations of vehicle rail, the coupling dynamic equations of vehicle body models under integrated rail bed, plate rail bed and floating plate rail structure are established, respectively, and the vibration response of vehicle body models under three kinds of rail structure is calculated. The evaluation indexes of dynamic characteristics of rail coupling are analyzed. The analysis results show that with the increase of subway speed, the vertical displacement and acceleration between the vehicle and the middle point of the track gradually increase, and the vibration response of the fourth wheel to the maximum wheel-rail force also gradually increases. With the increase of the buried depth of subway tunnel, the maximum vertical displacement and ground motion acceleration of the three tracks gradually decrease, which indicates that this method can accurately analyze the vibration response of subway under different track structures.

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Section: Introductionmentioning

confidence: 99%

Numerical analysis of influence of different track structures on vibration response of subway

Zhou

2020

THERM SCI

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“…Patel [9] experimentally studied premixed turbulent combustion in a semi-confined explosion chamber, the experiment showed that the turbulence stretch dominated in regions behind the obstacles due to the presence of highly recirculating zones while the mean flamelet stretch was dominant in the flow jetting regions around the obstacles. Chen [10] studied the effects of the plate with different slit number on gas explosions by experiment and LES (Large Eddy Simulation), showed that the plate slits in a closed tube can result in flame acceleration of premixed methane/air [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

“…Zheng [35] studied the effect of ignition position and equivalence ratio on the characteristics of premixed hydrogen/air explosions. Wang [36] studied the effect of concentration and obstacles on methane-air mixture deflagration to detonation transition, showed that a high number of obstacles in the duct can increase flame turbulence and lead to flame acceleration [20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Effect of Air Pollution Caused by Methane-Air Deflagration Characteristics

Zhang¹,

Feng²,

Zhang³

et al. 2020

Rev. Chim.

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In order to study the effect of combustible gas cloud releasing from FPSO upper deck facilities deflagration characteristics on air pollution, a semi-open open test pipe system was built. By changing the initial conditions such as the obstacles length, distance between obstacles, section shape of obstacles and pipe system structure, the flame propagation mechanism and overpressure changing rules of methane / air deflagration were analyzed. As a result of that, the degree of sufficiency of methane combustion was analyzed, which could be seen as air pollution level. With the increase of the length of obstacle and decrease of the distance between obstacles, the induced turbulence increased, the compression effect of unburned gas became stronger, the combustion of combustible gas became more intense and sufficient, and the flame propagation speed and the maximum overpressure increased. The effect of square cross section was more obvious on inducing turbulence than that of rectangular cross section and circular cross section. The flame front was divided into many small flames by the pipe structure obstacle, and the flame front showed as a `spiny` shape. Under the effect of �spiny� flame, the methane combustion was more sufficient, and the maximum overpressure value was 3.1 times of the circular section obstacle condition. In conclusion, as the methane-air deflagration becoming more serious, although the overpressure and flame speed would be higher and the extent of damage to the surrounding facilities would be more serious, the air pollution causing by unburned gas would abate.

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“…The application of the laser surface structuring method may be relevant for the improvement of wear-resistant properties of such highly loaded and operated under severe conditions objects as steam turbine blades. Creation of relief with known and specific required geometric parameters can potentially increase the ability of the blade material to withstand various types of destructions [15,16].…”

Section: Introductionmentioning

confidence: 99%

“…Various combinations of the considered methods will allow to endow the surface with both hydrophilic and hydrophobic properties [12][13][14][15][16] and to improve it's strength characteristics, which in aggregate should contribute to increase the resistance of the material to droplet load.…”

Section: Introductionmentioning

confidence: 99%

Metallographic studies results of 20kH13 steel samples with textured relief, modified surface and protective coating

et al. 2019

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One of the possible ways to improve passive methods of the steam turbine blade material protection from water droplet erosion is to create “smart”-surface that combines the properties and characteristics that could not be implemented simultaneously when using one or another proven method of protection. To solve the problem of developing such surface, this article presents the metallographic researches results of the blade steel 20kH13 samples with various already used and promising passive methods of protection, consisting in the use of ion-plasma and polyurethane coatings, surface modification by means of diffusion saturation with nitrogen ions, creation of the structured surface relief by laser ablation. The results of the carried out researches have allowed to reveal both morphology of a possible “smart”-surface, and influence on a microstructure and characteristics of a near-surface layer of samples after treatments considered.

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Influence of solid particle erosion (SPE) on safety and economy of steam turbines

Cited by 67 publications

References 14 publications

Numerical analysis of influence of different track structures on vibration response of subway

Numerical analysis of influence of different track structures on vibration response of subway

Experimental Study on the Effect of Air Pollution Caused by Methane-Air Deflagration Characteristics

Metallographic studies results of 20kH13 steel samples with textured relief, modified surface and protective coating

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