Numerical investigation on sealing performance of non-contact finger seal with herringbone groove surface topography

2021 ◽  
Author(s):  
Lingping Chen ◽  
Yanchao Zhang ◽  
Yahui Cui ◽  
Bowen Zhi ◽  
Jie Wang ◽  
...  
Keyword(s):  
Working Conditions ◽  
Design Method ◽  
General Structure ◽  
Uniform Design ◽  
Bottom Surface ◽  
Groove Surface ◽  
Sealing Performance ◽  
Analysis Of Results ◽  
Internal Angle ◽  
Uniform Design Method

Abstract Since the last decade, the non-contact finger seal (NCFS) has attracted an increasing number of researchers due to its inherent flexibility and non-contact features, which can significantly improve the service life and reduce the leakage rate of the finger seals. In this paper, to enhance the NCFS sealing performance, lifting pads with twenty (20) different herringbone groove surface topographies are proposed based on the uniform design method. Numerical analysis is carried out based on the two-way fluid-structure interaction (FSI) method to better mimic the actual working conditions. The analysis of results using statistical tools reveals that the herringbone groove topographies placed on the bottom surface of low-pressure lifting pads can significantly improve the load-carrying capacity and sealing performance. In addition, the correlation analysis of the sealing performance and geometric parameters of the herringbone groove demonstrate that reducing the groove width or increasing the groove internal angle can improve the lifting and leakage capacities. Finally, the optimal herringbone groove and general structure (no groove) are comparatively analysed under variable working conditions, and the results show that the former has much better sealing performance.

scholarly journals Optimization of the extraction and purification of Corydalis yanhusuo W.T. Wang based on the Q-marker uniform design method

BMC Chemistry ◽  
2020 ◽  
Vol 14 (1) ◽  
Author(s):  
Yongping Zhang ◽  
Zuhua Wang ◽  
Jian Xu ◽  
Fangfang Yang ◽  
Chuanyang Dai ◽  
...  
Keyword(s):  
Design Method ◽  
Uniform Design ◽  
Extraction And Purification ◽  
Uniform Design Method

scholarly journals Effect of Mixed Commercial Cold Flow Improvers on Flow Properties of Biodiesel from Waste Cooking Oil

Processes ◽  
2020 ◽  
Vol 8 (9) ◽  
pp. 1094
Author(s):  
Siyu Nie ◽  
Leichang Cao
Keyword(s):  
Design Method ◽  
Uniform Design ◽  
Waste Cooking Oil ◽  
Cold Filter Plugging Point ◽  
Depressing Effect ◽  
Obvious Effect ◽  
Cold Flow ◽  
Cooking Oil ◽  
Uniform Design Method ◽  
Solidifying Point

The uniform design method was used to screen the solidifying point depressing effects of 18 traditional diesel cold flow improvers on biodiesel derived from waste cooking oil. The cold flow improvers with good effects were selected for orthogonal optimization. Finally, the mixed cold flow improver (CFI) with the best depressing effect was selected to explore its depressing mechanism for biodiesel. The results show that the typical CFIs such as A132, A146, 10-320, 10-330, A-4, CS-1, AH-BSFH, Haote, T1804D, and HL21 all have a certain solidifying point depressing effect on biodiesel, while other cold flow improvers had no obvious effect. Amongst them, 10-330 (PMA polymer) and AH-BSFH (EVA polymer) had better solidifying point depressing effects over others, both of which reduced the solidifying point (SP) of biodiesel by 4 °C and the cold filter plugging point (CFPP) by 2 °C and 3 °C, respectively. From the orthogonal mixing experiment, it can be seen that the combination of 10-330 and AH-BSFH at a mass ratio of 1:8 had the best depressing effect, reducing the solidifying point and cold filter plugging point of biodiesel by 5 °C and 3 °C, respectively. Orthogonal analysis showed that when used in combination, AH-BSFH had a greater impact on the solidifying point, while the ratio of the combination had a greater impact on the cold filter plugging point.

Research on the Cutting Fluid Effect on Cutting Force and Surface Roughness in Rotor Milling

2012 ◽  
Vol 723 ◽  
pp. 50-55
Author(s):  
Jian Lu Wang ◽  
Liang Liang Wu ◽  
Jun Zhang ◽  
Wan Hua Zhao ◽  
Yi Fei Jiang ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Cutting Force ◽  
Design Method ◽  
Uniform Design ◽  
Cutting Speed ◽  
Cutting Parameters ◽  
Cutting Fluid ◽  
Cutting Depth ◽  
Multivariable Regression ◽  
Uniform Design Method

A series of milling experiments with and without cutting fluid, arranged by uniform design method, were carried out on rotor material. The influence of cutting fluid on cutting force and surface roughness was explored and compared for the two kinds of conditions. The associated model was established between cutting force & surface roughness and cutting parameters according to the linear multivariable regression method. The results show that the cutting force deceases with the increase of the cutting speed or with the decrease of the feed per tooth and the cutting depth. Cutting fluid has little effect on cutting force, and for surface roughness, the influence of cutting fluid is uncertain.

Uniform Design on the Forward Annular Shaped Charge of Torpedo Tandem Warhead

2014 ◽  
Vol 556-562 ◽  
pp. 1263-1266
Author(s):  
Lei FU ◽  
Wei Li Wang ◽  
Ying Zi Jiang ◽  
Xue Feng Huang ◽  
Jin Lv
Keyword(s):  
Penetration Depth ◽  
Design Method ◽  
Uniform Design ◽  
Shaped Charge ◽  
Opening Angle ◽  
Structure Parameters ◽  
Uniform Design Method ◽  
3D Software

By using LS-DYNA 3D software, the structure of forward annular shaped charge of torpedo tandem warhead is optimized in the simulation with uniform design method. During the simulation of annular shaped charge penetration into the plate underwater, the liner opening angle,liner thickness,charge height and charge angle are taken as factors, while the penetration depth is taken as index. The optimized structure parameters resulted form simulation can be used in the design of torpedo.

Study on Performance of Hot Pressed High Phosphorus-Boron Iron-Based Bit Matrix and Diamond Bit

2009 ◽  
Vol 416 ◽  
pp. 386-390
Author(s):  
Zhan Yang ◽  
Bing Suo Pan ◽  
Kai Hua Yang
Keyword(s):  
Regression Models ◽  
Design Method ◽  
Uniform Design ◽  
Rock Formations ◽  
Matrix Formula ◽  
Iron Based ◽  
Uniform Design Method ◽  
Bit Life ◽  
Diamond Bit ◽  
Matrix Hardness

Formula uniform design method was adopted to study the performance of iron-based matrix with high content of phosphorus and boron. Two forms of regression models on matrix hardness and wear resistance and the optimum matrix formulae were obtained respectively by regression analysis and constrained nonlinear programming using MATLAB. Regression analyses indicate that matrix hardness was mainly affected by the factor of Ni, Co and Fe; matrix hardness and brittleness increased with the increment of P-Fe alloy, but decreased with the increase of 663-Cu. These results can be used as a rough guide for design of highly adaptive diamond bits for different rock formations. After the indoor experiments, diamond bit based on 3# matrix formula was made to perform field drilling tests. The results were that the penetration rate was 1.91m/h and the average diamond bit life was 67.37m.

Optimization on Uniform Design for Preparing Monodisperse P(St/BA/AA) Microsphere by Dispersion Polymerization

2011 ◽  
Vol 225-226 ◽  
pp. 1167-1170
Author(s):  
Jin Xian Lin
Keyword(s):  
Dispersion Polymerization ◽  
Design Method ◽  
Uniform Design ◽  
Regression Equation ◽  
Polymerization Reaction ◽  
Regression Equations ◽  
Stabilizer Concentration ◽  
Mechanism Research ◽  
Predicted Values ◽  
Uniform Design Method

The uniform design method is used to arrange experiment of dispersion polymerization of styrene, butyl acrylate and acryl acid. The stepwise regression technique is adopted to analyze the results. The mathematical models are built by regression equations between the microsphere conversion rate, the size and its distribution. There are many influencing factors, such as, 3 monomer concentrations, stabilizer concentration, initiator concentration, ratio of alcohol and water, temperature established, and their reliabilities evaluated. Although the predicted values from regression equation different from the observed values (relative divergences less than 10%)，the regression equation can be used for designing particles and mechanism research. All above researches can be used for optimizing dispersion polymerization reaction conditions.

Wear Reliability Analysis Method Based on Random Process

2012 ◽  
Vol 155-156 ◽  
pp. 348-351
Author(s):  
Yu Tao Yan ◽  
Zhi Li Sun ◽  
Guang Wei Hu ◽  
Li Fang Liu
Keyword(s):  
Random Process ◽  
Reliability Analysis ◽  
Test Data ◽  
Design Method ◽  
Uniform Design ◽  
Surface Hardness ◽  
Analysis Method ◽  
Analysis Model ◽  
Function Fitting ◽  
Uniform Design Method

The random reliability analysis model for wear was established based on random process theory and wear research. The wear experiment scheme on load, sliding speed, surface hardness and bearing capacity of lubrication was instituted by the uniform design method, and carried out on a vertical universal friction/wear tester. The static wear predication model was established by the partial least squares based on test data. It is found that the wear extent obey to normal distribution by checkout of the probability paper and mathematic expectation function fitting and residuals distribution, the variance function fitting and residuals distribution based on the test data of random process. The reliability of definite working life was gained by calculating with established reliability model, and compared with test data, the analysis method is a valid method for wear reliability.

Optimum Condition for 2, 6-DNT –Microbe Degrading Using Uniform Design

2011 ◽  
Vol 255-260 ◽  
pp. 2958-2961
Author(s):  
Yu Bin Ji ◽  
Chang Ru Xu ◽  
Chen Feng Ji ◽  
Lang Lang
Keyword(s):  
Optimum Condition ◽  
Design Method ◽  
Uniform Design ◽  
Result Show ◽  
Uniform Design Method

The GC-ECD was used in this study. The optimization of preparation was performed by U9(94)uniform design method, With the rate of 2,6-DNT -degrading result as investigative indexes, the influences of ratio the concentration of substrate and PH, The speed of shaker and Temperature .the result were screened by Uniform Design to found the optimum condition of degrading . Result the optimum condition for 2, 6-DNT -degrading as following: The concentration of substrate is 135mg/L, pH=7.3, Temperature is 29°C, speed of shaker is 129 rpm/min. The result show: It is scientific and feasible to screen the experimental condition of for 2，6-DNT - degrading by using the uniform design and regression.

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