Square table form internal and external flow section recharge well with filter layer

2015 ◽  
pp. 921-923
Author(s):  
Zhiyuan Yin ◽  
Wanglin Li ◽  
Na Li ◽  
Fang Xu ◽  
Zhengguo Zhao
Keyword(s):  
External Flow ◽  
Flow Section ◽  
Filter Layer ◽  
Recharge Well

Square internal and external flow section recharge well with filter layer

2015 ◽  
pp. 485-488
Author(s):  
Na Li ◽  
Wang Li ◽  
Yi Yang ◽  
Zhi Yin ◽  
Fang Xu
Keyword(s):  
External Flow ◽  
Flow Section ◽  
Filter Layer ◽  
Recharge Well

Influence of Sediments on Permeability of Recharge Well with Filter Layer during Artificial Recharge of Groundwater

2011 ◽  
Vol 255-260 ◽  
pp. 2806-2809 ◽  
Author(s):  
Wang Lin Li ◽  
Ying Te Li
Keyword(s):  
Surface Layer ◽  
Artificial Recharge ◽  
Layered Soil ◽  
Soil Specimen ◽  
Permeability Test ◽  
Vertical Permeability ◽  
Coefficient Of Permeability ◽  
Groundwater Reservoir ◽  
Filter Layer ◽  
Recharge Well

A kind of recharge well with filter layer exists in recharge engineering of Wanghe groundwater reservoir in Laizhou city of China. During artificial recharge of groundwater, layered sediments will silt in the surface layer of recharge well with filter layer. Through doing vertical permeability test of combined soil specimen of silt and sand, we simulate permeability influence to filter layer of recharge well with filter layer during artificial recharge of groundwater. The test indicates that silt reduces permeability of filter layer and recharge capacity of recharge well with filter layer. Also we discover that there are errors in theoretical calculated value of coefficient of permeability for combined soil specimen by the formula of equivalent coefficient of permeability in layered soil, which need to be corrected.

Geotextile Recharge Well with Filter Layer

2012 ◽  
Vol 212-213 ◽  
pp. 453-456
Author(s):  
Ying Te Li ◽  
Wang Lin Li
Keyword(s):  
Design Method ◽  
Wall Material ◽  
Theoretical Formula ◽  
Hard Wall ◽  
Single Well ◽  
Filter Layer ◽  
Recharge Well

Recharge well with filter layer is a sort of valid recharge facility in groundwater reservoirs, which is constituted by recharge well and recharge pool. The main problems of existing recharge well with filter layer are analyzed in this paper; the main reason of these problems is concluded as the defective design of the wellhead structure; the optimal outer design method of recharge pool is studied. In order to increase single-well recharge volume, improve anti-silt and anti-rush capability of recharge well and save sand-gravel materials, geotextile material and hard wall material are adopted; a new sort of geotextile recharge well with filter layer is developed. The theoretical formula of single-well recharge volume is deduced.

scholarly journals High-Speed Elevator Car Air Pressure Compensation Method Based on Coupling Analysis of Internal and External Flow Fields

2021 ◽  
Vol 11 (4) ◽  
pp. 1700
Author(s):  
Lemiao Qiu ◽  
Huifang Zhou ◽  
Zili Wang ◽  
Shuyou Zhang ◽  
Lichun Zhang ◽  
...  
Keyword(s):  
Pressure Fluctuation ◽  
Iterative Learning Control ◽  
High Speed ◽  
Learning Control ◽  
Flow Fields ◽  
External Flow ◽  
Iterative Learning ◽  
Air Pressure ◽  
Coupling Analysis ◽  
Pressure Compensation

As the demand for high-speed elevators grows, the requirements of elevator performance have also developed. The high speed will produce strong airflow disturbances and drastic pressure changes, which is prone to cause passenger discomfort. In this paper, an elevator car air pressure compensation method based on coupling analysis of internal and external flow fields (IE-FF) is proposed. It helps to adaptively track the ideal air pressure curve (IAPC) inside the car and controls the air pressure fluctuation to improve the ride comfort of the elevator. To obtain the air pressure transient value in the elevator car, an IE-FF modeling method is proposed. Based on the IE-FF model, the air pressure compensation system is developed. To realize the air pressure compensation inside the car, an adaptive iterative learning control (A-ILC) algorithm is proposed, to eliminate the passengers’ ear pressing due to the severe air pressure fluctuation. To verify the proposed method, the KLK2 (Canny Elevator Co., Ltd., 2015, Suzhou, China) high-speed elevator is applied. The numerical experiment results show that the proposed method has higher tracking accuracy and convergence speed compared to the classical Proportion Integral Differential (PID) algorithm and the Proportion Integral-iterative learning control (PD-ILC) algorithm.

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