Numerical Analysis of Valve Structure of High Power Marine Engine

Deng, Lei; Meng, Huang; Qiangzhi, Xin; Zongjian, He; Jia, Baohua; Wang, Zhiming; He, Jiayuan

doi:10.21278/brod72207

Cited by 3 publications

(3 citation statements)

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“…Considering the system composed by the owner and the general contractor, the development of the engineering project is abstracted into a process in which the general contractor organizes the construction and the owner supervises the inspection and acceptance [1] .…”

Section: The Quality Cost Game Considering Reward and Punishmentmentioning

confidence: 99%

Research on quality cost decision between owner and general Contractor

Huang¹

2023

Proceedings of the 2nd International Conference on Engineering Management and Information Science, EMIS 2023, February 24-26, 2

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In the increasingly fierce competition in the construction industry, the supply is greater than the demand of the market environment, the way of winning the project procurement at a low price has increased the test of how to deal with the contradiction between cost and quality. The amount of the appraisal cost of the owner's quality cost affects its probability of success in the process of supervision and inspection, and the amount of the prevention cost of the general contractor's quality cost affects its probability of project quality qualification in the process of construction. Based on the quality cost theory, this paper takes the owner and the general contractor as the game parties, establishes the game matrix of the quality cost of both parties, and obtains the optimal quality cost decision of both parties through the game matrix analysis, that is, both the owner and the contractor need to invest in quality improvement to improve the quality of building products.

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Section: The Quality Cost Game Considering Reward and Punishmentmentioning

confidence: 99%

Research on quality cost decision between owner and general Contractor

Huang¹

2023

Proceedings of the 2nd International Conference on Engineering Management and Information Science, EMIS 2023, February 24-26, 2

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“…However, apart from this approach, numerical uncertainty has to be determined. [28] The uncertainty assessment was conducted for the unique flow conditioner at maximum inlet pressure (10 bar) and 200mm length. The uncertainty sources were selected as grid spacing and time step similar with a recent study [29].…”

Section: Uncertainty Assessmentmentioning

confidence: 99%

An Extensive Investigation of Flow Conditioners Inside a Fi-Fi Monitor

Bilir

Doğrul

Vardar

2022

brod

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As it is known, to provide fire protection for any type of surface vessel, external fire-fighting (EFF) systems have been commonly used for decades as well as in coastal regions. These types of systems exist on several types of vessels such as fire-fighting ships, tugboats, supply vessels and naval vessels. Flow conditioners can be used in the EFF systems to provide better performance by regulating the flow inside the fi-fi monitor. In the present study, a fire-fighting (fi-fi) monitor was designed and different flow conditioners were implemented into the fi-fi monitor. A unique flow conditioner was designed in addition to the recommended ones by ISO 5167-3 in order to improve the performance of the flow conditioner in terms of head ratio and flow rate. A commercial computational fluid dynamics (CFD) solver was used to investigate the performance of the different flow conditioners. Before comparing the numerical results of different flow conditioners, the numerical model was validated with the experimental data and verified with appropriate methods. The results showed that the unique flow conditioner successfully regulates the streamlines and it has better performance than the recommended ones by ISO 5167-3 in terms of flow rate and head ratio. As the last part of the study, the effect of unique flow conditioner length was investigated and the best length was determined.

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“…As an important contact pair in the engine valve train, the opening and closing between the valve and seat insert control the entry of fresh air and the discharge of hightemperature gas in the cylinder. The valve -seat insert not only bear the cyclic impact caused by the explosion pressure, but also bear the erosion and corrosion of the high-temperature gas [8][9][10]. The failure of valves and seat inserts leads to the reduction of engine compression power and the increase of fuel consumption [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Improvement of impact wear properties of seat insert by laser cladding cobalt-based alloy

Qu¹,

Duan²,

Hu³

et al. 2022

Surf. Topogr.: Metrol. Prop.

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The impact wear properties of two different contact pairs, N80A valve-cast iron seat insert (cast iron group) and N80A valve-clad seat insert (cladding group), were studied in this work. In this paper, an independently designed tribo-tester combined with a depth gauge and corresponding auxiliary devices can record the axial subsidence of the contact pairs during the entire worn process. The results showed that during the 5 × 106 impact test, cast iron groups and cladding groups followed the worn process curve, and all went through the running-in stage and the stable worn stage. However, at each stage, the subsidence of cladding groups was smaller than that of cast iron groups. The roughness meter not only recorded the roughness of all samples before and after the test, but also can obtain the respective subsidence of the samples through the difference between the profiles before and after the test. The results can be mutually corroborated with the axial subsidence measured by the depth gauge. As a result, the roughness of the sealing surfaces of all valve-seat inserts increased significantly after the impact test. The total worn subsidence of the cast iron groups was about 1.61 times that of the cladding groups. The worn morphology was further studied by scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). The cast iron group mainly experienced serious adhesive wear and oxidation wear, while the cladding group mainly experienced fatigue wear, oxidative wear and abrasive wear.

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Numerical Analysis of Valve Structure of High Power Marine Engine

Cited by 3 publications

References 0 publications

Research on quality cost decision between owner and general Contractor

Research on quality cost decision between owner and general Contractor

An Extensive Investigation of Flow Conditioners Inside a Fi-Fi Monitor

Improvement of impact wear properties of seat insert by laser cladding cobalt-based alloy

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