A Cephalopod-Inspired Soft-Robotic Siphon for Thrust Vectoring and Flow Rate Regulation

Soft Robotics ◽  
2020 ◽  
Author(s):  
Runzhi Zhang ◽  
Zhong Shen ◽  
Hua Zhong ◽  
Jiyong Tan ◽  
Yong Hu ◽  
...  
Keyword(s):  
Flow Rate ◽  
Thrust Vectoring ◽  
Rate Regulation

scholarly journals Analyzing the Energy Efficiency of Fan Systems by Using the Dimensional Analysis (DA) Method

Symmetry ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 537 ◽  
Author(s):  
Gencho Popov ◽  
Kliment Klimentov ◽  
Boris Kostov ◽  
Reneta Dimitrova
Keyword(s):  
Energy Efficiency ◽  
Dimensional Analysis ◽  
Flow Rate ◽  
Energy Use ◽  
Specific Energy Consumption ◽  
Effective Energy ◽  
Frequency Method ◽  
Rate Regulation ◽  
Pipe System ◽  
The Impact

This work represents a method for investigating the energy efficiency of fan systems used to transport fluids. Applying the methods of dimensional analysis (DA) enables establishing five dimensionless complexes ( π criteria), including some basic parameters having impacts on the consumed energy used for the transportation of a unit quantity of air. The proposed criterion π 1 includes the specific energy consumption e v (specific fan power SFP), and is used for the quantitative evaluation of the energy effectiveness of the fluid transportation. This criterion also includes the main geometric size of the pipe system (network) and the gas properties. The criterion π 3 indicates the impact of the applied method of flow rate regulation on the effective energy use of fan systems. This criterion includes parameters characterizing the selected method of flow rate regulation: speed ( n ) for using the frequency method and the referred length ( L T P ) of the pipe system for using the throttle method. The established (proposed) dimensionless parameters are used to study a concrete fan system. The obtained results concerning the evaluation of the impact of the two most used methods of flow rate regulation (frequency and throttle), as well as the density variation as a result of the temperature change, on the effective energy use are graphically presented: π 1 = f ( π 3 ) .

A New Shunt System with Non-Invasive Flow Rate Regulation and Pressure Measurement

Hydrocephalus ◽  
1991 ◽  
pp. 422-431 ◽  
Author(s):  
Takuo Hashimoto ◽  
Norio Nakamura ◽  
Toshinori Kanki ◽  
Hideaki Shimazu ◽  
Ken-ichi Yamakoshi ◽  
...  
Keyword(s):  
Flow Rate ◽  
Pressure Measurement ◽  
Shunt System ◽  
Rate Regulation ◽  
Non Invasive

Research Progress on Variable-Rate Spraying Technology in Orchards

2020 ◽  
Vol 36 (6) ◽  
pp. 927-942
Author(s):  
Chenchen Gu ◽  
Xiu Wang ◽  
Xiaole Wang ◽  
Fuzeng Yang ◽  
Changyuan Zhai
Keyword(s):  
Flow Rate ◽  
Liquid Flow ◽  
Liquid Flow Rate ◽  
Future Research ◽  
Variable Rate ◽  
Rate Regulation ◽  
Advantages And Disadvantages ◽  
Air Supply ◽  
Canopy Volume ◽  
Variable Rate Spraying

HighlightsReview the research status of variable-rate spraying technology and point out the direction for the future researchDiscussed the advantages and disadvantages of different techniques to detect canopy volume and canopy biomassThe air speed and volume adjustment need to be controlled based on the canopy detection systemAbstract. Variable-rate pesticide application in orchards aims to solve the problems of low pesticide utilization rates and serious environmental pollution in traditional pesticide applications. In this article, we have reviewed the research status of the technology to point out the direction for future research. Orchard tree canopy volume detection, biomass detection, and variable-rate spraying control methods were systematically summarized and analyzed. The advantages and disadvantages of different sensing techniques for detecting canopy volume and canopy biomass have been discussed. Canopy volume is mainly detected by ultrasonic sensors and light detection and ranging (LiDAR) sensors. Canopy biomass detection can be realized by manual, ultrasonic sensors, LiDAR sensors, and other sensors. Variable-rate spraying control is in two parts: liquid flow rate regulation and air supply rate regulation. In order to determine the volume of the liquid variable-spray, the variable air supply of air-assisted sprayer has been proven to be important. Liquid flow regulation can be achieved by pipeline pressure control and nozzle flow rate control together with a series of algorithms. The direction of air supply is easy to determine, but the air speed and volume adjustment need to be controlled based on the canopy detection system. Finally, future research on variable-rate spraying technology should focus on: 1) the application of advanced sensing technology for accurate and real-time measurement of canopy volume and biomass, 2) accurate control algorithms for liquid flow rate regulation and methods for airflow regulation, and 3) design of variable-rate sprayers with both liquid and air regulations, and the establishment of different types of variable-rate models for different sprayer types. Keywords: Air supply rate regulation, Canopy biomass detection, Canopy volume detection, Liquid flow rate regulation, Orchard, Variable-rate spraying.

Experimental and computational investigation into the use of co-flow fluidic thrust vectoring on a small gas turbine

2008 ◽  
Vol 112 (1127) ◽  
pp. 17-25 ◽  
Author(s):  
A. Banazadeh ◽  
F. Saghafi ◽  
M. Ghoreyshi ◽  
P. Pilidis
Keyword(s):  
Gas Turbine ◽  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Thrust Vectoring ◽  
Air Mass ◽  
Engine Thrust ◽  
Secondary Air ◽  
Static Conditions ◽  
Fluidic Thrust Vectoring

Abstract This paper presents the application of a relatively new technique of fluidic thrust-vectoring (FTV), named Co-flow, for a small gas-turbines. The performance is obtained via experiment and computational fluid dynamics (CFD). The effects of a few selected parameters including the engine throttle setting, the secondary air mass-flow rate and the secondary slot height upon thrust-vectoring performance are provided. Thrust vectoring performance is characterised by the ability of the system to deflect the engine thrust with respect to the delivered secondary air mass-flow rate. The experimental study was conducted under static conditions in an outdoor environment at Cranfield University workshop that was especially designed for this purpose. As part of this investigation, the system was modelled by CFD techniques, using Pointwise’s Gridgen software and the three-dimensional flow solver, Fluent. Also, Cranfield’s gas-turbine performance code (TurboMatch) was utilised to estimate boundary conditions for the CFD analysis with respect to the integrated nozzle. The presented technique is easy-to-use approach and offers better result for thrust-vectoring problems than previously published works. Experimental results do show the overall viability of the blowing slot mechanism as a means of vectoring the engine thrust, with the current configuration. Computational predictions are shown to be consistent with the experimental observations and make the CFD model a reliable tool for predicting Co-flow fluidic thrust-vectoring performance of similar systems.

scholarly journals Differential Throttling and Fluidic Thrust Vectoring in a Linear Aerospike

2021 ◽  
Vol 6 (2) ◽  
pp. 8
Author(s):  
Michele Ferlauto ◽  
Andrea Ferrero ◽  
Matteo Marsicovetere ◽  
Roberto Marsilio
Keyword(s):  
Flow Field ◽  
Secondary Flow ◽  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Stokes Equations ◽  
Navier Stokes ◽  
Combustion Chambers ◽  
Thrust Vectoring ◽  
Fluidic Thrust Vectoring

Aerospike nozzles represent an interesting solution for Single-Stage-To-Orbit or clustered launchers owing to their self-adapting capability, which can lead to better performance compared to classical nozzles. Furthermore, they can provide thrust vectoring in several ways. A simple solution consists of applying differential throttling when multiple combustion chambers are used. An alternative solution is represented by fluidic thrust vectoring, which requires the injection of a secondary flow from a slot. In this work, the flow field in a linear aerospike nozzle was investigated numerically and both differential throttling and fluidic thrust vectoring were studied. The flow field was predicted by solving the Reynolds-averaged Navier–Stokes equations. The thrust vectoring performance was evaluated in terms of side force generation and axial force reduction. The effectiveness of fluidic thrust vectoring was investigated by changing the mass flow rate of secondary flow and injection location. The results show that the response of the system can be non-monotone with respect to the mass flow rate of the secondary injection. In contrast, differential throttling provides a linear behaviour but it can only be applied to configurations with multiple combustion chambers. Finally, the effects of different plug truncation levels are discussed.

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