The influence of nozzle chamber structure and partial-arc admission on the erosion characteristics of solid particles in the control stage of a supercritical steam turbine

Cai, Liuxi; Wang, Shun-sen; Mao, Jing-ru; Dounan, Jia; Feng, Zhenping

doi:10.1016/j.energy.2015.01.044

Cited by 18 publications

(6 citation statements)

References 16 publications

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“…Through systematic numerical simulation, the speed of the solid particles impacting the turbine blades was observed to be in the range 200 m/s~350 m/s [ 23 ], thus, two particle impact speeds of 210 m/s and 320 m/s were chosen. Based on the intake temperature of the supercritical steam turbine and final stage compression temperature of the aero-engine compressor, 566 °C was selected as the test temperature.…”

Section: Methodsmentioning

confidence: 99%

Investigation of the Erosion Damage Mechanism and Erosion Prediction of Boronized Coatings at Elevated Temperatures

Cai

Wang

et al. 2020

Materials

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In this study, the high temperature erosion mechanisms and damage characteristics of a boronized coating have been systematically studied by employing an improved high-temperature accelerated erosion test bench and impact contact theory analyses. Within the scope of the experimental parameters, the erosion rate of the boronized coating under the same erosion conditions was observed to be only one half to one-twelfth of the erosion rate of the substrate. Furthermore, the boronized coating was noted to be less sensitive to the speed of the erosion particles than the plastic substrate, thus, indicating superior and more stable erosion resistance than the base material. The boronized coating exhibited typical brittle fracture characteristics under impact by the high-speed particles. When the particle impact normal stress exceeded the critical stress for crack propagation owing to the coating defects, the surface and subsurface layers of the coating initially formed horizontal and vertical micro-cracks, followed by their gradual expansion and intersection. After destabilization, the brittle coating material was peeled layer-by-layer from the surface of the test piece. At the same incident speed, as the particle size was increased from 65 μm to 226 μm and 336 μm, the size (width) of the erosion cracks on the coating surface increased from 1 μm to 30 μm and 100 μm respectively. Correspondingly, the erosion damage thickness of the coating was enhanced from 15 μm to 50 μm and 100 μm. In the case of the quartz sand particle size exceeding 300 μm, the dual-phase boronized coating did not provide effective protection to the substrate. Furthermore, based on the elastoplastic fracture theory, a prediction model for the erosion weight loss of the boronized coatings within the effective thickness range has been proposed in this study.

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Section: Methodsmentioning

confidence: 99%

Investigation of the Erosion Damage Mechanism and Erosion Prediction of Boronized Coatings at Elevated Temperatures

Cai

Wang

et al. 2020

Materials

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“…Besides, factors which will affect the test accuracy of particle erosion and rebound characteristics should be eliminated as much as possible in the test. Erosion rate model established through high temperature test results in the literature 3 is used in this article. During the erosion process, the differences in particle size and shape, the variation of surface morphology of the target, and the uncertainty of particle orientation on the wall surface result in a highly random motion behavior of flake particles.…”

Section: Erosion Rate Model and Particle Rebound Modelmentioning

confidence: 99%

“…Based on the investigations in literatures, 3,5 the size of oxide particles in the flow path of steam turbine is usually smaller than 150 mm. Thus, totally seven kinds of particles, including 10, 20, 40, 60, 80, 100, and 120 mm, are seeded at the inlet of cascade.…”

Section: Boundary Conditionsmentioning

confidence: 99%

“…The specific definition of (s r , h r ) and E s (i) can refer to the literature. 3 Figure 7 exhibits the trajectories of oxide particles with different sizes in the prototype governing stage cascade (g = 0°). As is shown, trajectory of particles smaller than 10 mm in the cascade is close to the direction of stream flow, and a large amount particles escape without impacting cascade surface.…”

Section: Spe Characteristics Of Governing Stage Bladesmentioning

confidence: 99%

“…Erosion of steam flow path will first increase the roughness of cascade surface and then change the cascade profile, which have a great impact on the safety and efficient operation of steam turbines. [1][2][3] Kawagishi et al 4 indicated that aerodynamic performance of governing stage nozzles reduced by 3% because of SPE. Khaimov et al 5 found that the unit efficiency decreased by 2.16% under part load operation due to SPE.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of oblique stator on the aerodynamic performance and erosion characteristics of governing stage blades in a supercritical steam turbine

Cai

Xiao

Gao

et al. 2019

Advances in Mechanical Engineering

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In this article, a new particle tracking model is established through high temperature erosion modeling test. Based on the model, steam-particle flows in the governing stage cascade of a supercritical steam turbine are systematically investigated and the influence of oblique stator on the aerodynamic performance and erosion characteristics of governing stage blades is carefully studied. Results show that with the increase of nozzle oblique angle, the maximum load position gradually moves toward nozzle trailing edge. Consequently, secondary flow loss of nozzle cascade gradually decreases. Compared with the prototype structure of governing stage, stage efficiency increases by 0.8%, 0.35%, and 0.44%, respectively, when nozzle oblique angle increases to 15°, 30°, and 45°. Meanwhile, erosion at the trailing edge of nozzle pressure side and leading edge of rotor suction side gradually decreases, while erosion of rotor pressure surface increases. The maximum erosion position of nozzle pressure surface and rotor suction surface keeps constant, but the maximum erosion position of rotor pressure surface gradually moves forward. Comprehensive analysis shows that when nozzle oblique angle reaches 30°, erosion of nozzle trailing edge reduces by 14%, and stage efficiency increases by 0.35%; erosion resistance and aerodynamic performance of governing stage can be both well considered.

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Deposition of iron oxides in supercritical water reactor: A review

Wang

Khan

et al. 2021

J Inorg Organomet Polym

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The influence of nozzle chamber structure and partial-arc admission on the erosion characteristics of solid particles in the control stage of a supercritical steam turbine

Cited by 18 publications

References 16 publications

Investigation of the Erosion Damage Mechanism and Erosion Prediction of Boronized Coatings at Elevated Temperatures

Investigation of the Erosion Damage Mechanism and Erosion Prediction of Boronized Coatings at Elevated Temperatures

Effect of oblique stator on the aerodynamic performance and erosion characteristics of governing stage blades in a supercritical steam turbine

Deposition of iron oxides in supercritical water reactor: A review

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