Dependence of Flow Characteristics of a High Performance S.I. Engine Intake System on Test Pressure and Tumble Generation Conditions - Part 1: Experimental Analysis

The chapter describes parallel-hierarchical technologies that are characterized by a high degree of parallelism, high performance, noise immunity, parallel-hierarchical mode of transmission and processing of information. The peculiarities of the design of automated geoinformation and energy systems on the basis of parallel-hierarchical technologies and modified confidential method of Q-transformation of information are presented. Experimental analysis showed the advantages of the proposed methods of image processing and extraction of characteristic features.

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Experimental analysis on thermal and friction factor characteristics of fluid flow in tube with novel double strip helical screw tape

Proceedings of the Institution of Mechanical Engineers Part A Journal of Power and Energy ◽

10.1177/0957650919885722 ◽

2019 ◽

Vol 234 (6) ◽

pp. 874-886

Author(s):

Shashank R Chaurasia ◽

RM Sarviya

Keyword(s):

Nusselt Number ◽

Fluid Flow ◽

Friction Factor ◽

Experimental Analysis ◽

Flow Characteristics ◽

Performance Ratio ◽

Working Fluid ◽

Flow Rates ◽

Twist Ratio ◽

Single Strip

An experimental analysis has been carried out to investigate the thermal and friction factor characteristics of fluid flow in a tube with double strip helical screw tape (DS-HST) inserts with different values of twist ratio and compared with single strip helical screw tape inserts and plain tube. Water is used as a working fluid at different flow rates with constant heat flux conditions. CFD analysis is also carried out to visualize thermal and fluid flow characteristics of fluid flow in tube with inserts. Experimental results have showed that Nusselt number and friction factor have attained excellent enhancement with double strip helical screw tape inserts in the range of flow rates than single strip helical screw tape inserts at the value of twist ratio 1.5. Correlation is also developed for Nusselt number with a range of Reynolds number, twist ratio and number of strips. Moreover, the performance ratio has attained maximum value at twist ratio of 2.5 with high values of flow rate. It is concluded that DS-HST is able to attain enhancement in the efficiency of heat exchanger, causing a reduction in size for thermal applications.

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Origin of the extra capacity in nitrogen-doped porous carbon nanofibers for high-performance potassium ion batteries

Journal of Materials Chemistry A ◽

10.1039/d0ta05626j ◽

2020 ◽

Vol 8 (35) ◽

pp. 18079-18086 ◽

Cited By ~ 1

Author(s):

Fang Liu ◽

Jiashen Meng ◽

Fanjie Xia ◽

Ziang Liu ◽

Haoyang Peng ◽

...

Keyword(s):

Carbon Nanofibers ◽

Porous Carbon ◽

Experimental Analysis ◽

High Performance ◽

Theoretical Calculations ◽

Potassium Ion ◽

Nitrogen Doped

The origin of the extra capacity of freestanding and porous N-doped carbon nanofibers was clearly revealed by systematic experimental analysis and theoretical calculations.

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Detailed Dynamic Modelling of an Integrated Hydraulic Actuator

BATH/ASME 2020 Symposium on Fluid Power and Motion Control ◽

10.1115/fpmc2020-2774 ◽

2020 ◽

Author(s):

Dom Wilson ◽

Ioannis Georgilas ◽

Andrew Plummer ◽

Pejman Iravani ◽

Dhinesh Sangiah

Keyword(s):

High Performance ◽

Dynamic Modelling ◽

Flow Characteristics ◽

Hydraulic Cylinder ◽

Theoretical Development ◽

Hydraulic Actuator ◽

Pressure Losses ◽

Low Leakage ◽

Smart Actuator ◽

And Control

Abstract Hydraulic servos are characterised by their high-performance nature but due to their size and weight are not suitable for robotics where new legged applications require high power density and excellent dynamic behaviour in a small size. As an answer to this need a new class of integrated smart actuators is being developed. These systems consist of a servo valve, hydraulic cylinder, sensors and a controller all in a single device. This paper outlines the detailed modelling of the smart actuator for use in simulation and control design. The result is a model consisting of the dynamics of the novel ultra-low leakage servovalve, the valve flow characteristics considering the properties of each spool land, the single-ended cylinder with friction and the pressure losses in the supply and return lines to the actuator. The models are a combination of empirical and theoretical development, validated with experimental data. The smart actuator’s unique properties; compactness, weight and efficiency, combined with high-performance hydraulics make it well suited to mobile robot applications.

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