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Study on the Gas-liquid Flow Characteristics in the Reversing Bucket of Water Jet Propulsion
Zhongyong Pan,Chunhai Cen,Ping Zong,Fall Ibra,Bo Yang 한국유체기계학회 2020 International journal of fluid machinery and syste Vol.13 No.2
To investigate the gas-liquid two-phase flow characteristics in the reversing bucket of water jet propulsion, the numerical simulations based on the Euler-Euler inhomogeneous model was conducted to the internal flow field of the reversing bucket under 1%~12% different inlet gas volume fractions (α). Based on that, the gas distribution, gas-liquid velocity streamlines and thrust changing were obtained to discuss the gas-liquid flow characteristics and the influence on the thrust of the reversing bucket. The calculation results show that the gas mainly distributes in the inner part of the reversing bucket flow passage under different inlet gas volume fractions. On the condition that the inlet gas volume fraction is more than 2%, the gas accumulation has occurred in the inlet section of the flow passage. With the increasing of inlet gas volume fraction, average velocity and pressure increase gradually at each cross-section of reversing bucket flow passage, and at the higher gas concentration in each cross-section, where the vortex will exist, indicating that the gas concentration has a great relationship with the vortex aggregation in the reversing bucket flow passage. When the inlet gas volume fraction is 7%, the thrust reaches the maximum. It shows that the appropriate gas can effectively improve the thrust efficiency of the reversing bucket.
Xingxi Pan,Wen Yang,Zhongyong Wen,Feilong Li,Lihua Tong,Wubing Tang 대한부인종양학회 2020 Journal of Gynecologic Oncology Vol.31 No.6
Objective: To compare survival outcomes between cervical adenocarcinoma (ADC) andsquamous cell carcinoma (SCC) using a propensity score matching (PSM) analysis based onthe Surveillance, Epidemiology, and End Results (SEER) Program. Methods: Patients diagnosed with cervical cancer between 1998 and 2016 were identifiedfrom the SEER database. The Kaplan-Meier method and Cox regression analysis were used toanalyze survival. A subgroup analysis of overall survival (OS) between patients with ADC andSCC was performed after the 1:1 PSM analysis. Results: Of the 33,148 patients, 24,591 (79.19%) had SCC and 8,557 (25.81%) had ADC. In theunmatched cohort, after adjustment in multivariate analysis, patients with ADC had a worseprognosis than patients with SCC (hazard ratio [HR]=1.12; 95% confidence interval [CI]=1.07–1.18; p<0.001). In the propensity matched cohort, Kaplan-Meier analysis and subgroup analysisshowed that ADC was associated with a worse prognosis than SCC (p=0.001). An analysisstratified by SEER stage revealed a worse prognosis for patients with ADC patients presentingwith a regional disease than patients with SCC (HR=1.24; 95% CI=1.14–1.36 p<0.001), but nostatistically significant differences were observed between the localized disease (HR=0.97; 95%CI=0.86–1.10; p=0.664) and distant disease (HR=1.09; 95% CI=0.97–1.22; p=0.162) subgroups. Conclusion: The significant differences in survival outcomes between patients with cervicalADC and SCC were only observed in the regional disease subgroup, but not in the localizeddisease and distant disease subgroups.
An Outlook on Rotordynamic Pump Theory Development
Ni, Yongyan,Pan, Zhongyong Korean Society for Fluid machinery 2017 International journal of fluid machinery and syste Vol.10 No.2
ECHO progress was defined to depict the rotordynamic pump theory development. Experience (E) era for pumps lasted nearly one and a half hundred years before the Industrial Revolution due to the low rotation speed of motor and undeveloped manufacture ability. Classic (C) theory referring to quasi-static performance as well as the items those were not able to be steadily resolved under the level were briefly and sophisticated outlined. Since 1962, flow instabilities and the dynamic responses had come into main attention with the development of the modern technologies such as ballistic missile, rocket and space shuttle main engine, and were finally heuristically (H) elucidated by talented scholars and researchers. Recently, new applications for the pumps open (O) to the surrounding fluid and diversity of the medium such as multiphase flow need more studies and some examples were briefly introduced to display the potential problems lastly.
An Outlook on Rotordynamic Pump Theory Development
Yongyan Ni,Zhongyong Pan 한국유체기계학회 2017 International journal of fluid machinery and syste Vol.10 No.2
ECHO progress was defined to depict the rotordynamic pump theory development. Experience (E) era for pumps lasted nearly one and a half hundred years before the Industrial Revolution due to the low rotation speed of motor and undeveloped manufacture ability. Classic (C) theory referring to quasi-static performance as well as the items those were not able to be steadily resolved under the level were briefly and sophisticated outlined. Since 1962, flow instabilities and the dynamic responses had come into main attention with the development of the modern technologies such as ballistic missile, rocket and space shuttle main engine, and were finally heuristically (H) elucidated by talented scholars and researchers. Recently, new applications for the pumps open (O) to the surrounding fluid and diversity of the medium such as multiphase flow need more studies and some examples were briefly introduced to display the potential problems lastly.
Observation of multi-channel non-local transport in J-TEXT plasmas
Shi, Yuejiang,Chen, Zhongyong,Yang, Zhoujun,Shi, Peng,Zhao, Kaijun,Diamond, Patrick H.,Kwon, JaeMin,Yan, Wei,Zhou, Hao,Pan, Xiaoming,Cheng, Zhifeng,Chen, Zhiping,Yang, SeongMoo,Zhang, Chi,Li, Da,Dong, IOP 2018 Nuclear fusion. Fusion nucléaire. &n.Illiga Vol.58 No.4
<P>In cold pulse experiments in J-TEXT, not only are rapid electron temperature increases in the core observed, but also steep rises in the inner density are found. Moreover, some evidence of acceleration of the core toroidal rotation is also observed during the non-local transport process of electron temperature. These new findings of cold pulse experiments in J-TEXT suggest that turbulence spreading is a possible mechanism for the non-local transport dynamics.</P>