NDLI: Design and Analysis of a Resonating Free Liquid-Piston Engine Compressor

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Riofrio, Jose´ A. Eric, J. Barth
Copyright Year	2007
Abstract	This paper presents the design and simulation of a resonating free liquid-piston compressor (FLPC) equipped with a separated combustion chamber. The FLPC is a proposed device that utilizes combustion of a hydrocarbon fuel to compress air into a high-pressure supply tank, thus potentially serving as a portable power supply candidate for untethered pneumatic systems of human-scale power. The energetic merits of the FLPC concept have been outlined and demonstrated in previous work, and this new design aims at meeting its intended power density, all while maintaining an adequate energy density in a compact and simple device. In this new design, the free “piston” consists of a slug of water (or another incompressible fluid) trapped between two high-stiffness elastomeric diaphragms, thus providing perfect blow-by sealing and near zero friction, while adequately presenting the dynamic elements needed for smooth, continuous operation at desirable resonant frequencies. The device is essentially a tuned resonator whereby the inertia of the liquid piston and the elasticity of the diaphragms are selected to achieve a given resonant frequency. The passive dynamics of the engine are exploited to achieve efficiency through over-expansion, and to enable a return stroke with the small investment made in elastic energy with each power stroke. Additionally, the implementation of a separated combustion chamber – along with built-in actuated, high-flow intake and exhaust valves – ensures the feasibility of such desirable frequencies by decoupling the injection dynamics from the free-piston dynamics. The design and implementation of the device is shown, and simulated results are discussed.
Starting Page	239
Ending Page	246
Page Count	8
File Format	PDF
ISBN	0791842983
DOI	10.1115/IMECE2007-42369
e-ISBN	0791838129
Volume Number	Volume 4: Design, Analysis, Control and Diagnosis of Fluid Power Systems
Conference Proceedings	ASME 2007 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2007-11-11
Publisher Place	Seattle, Washington, USA
Access Restriction	Subscribed
Subject Keyword	Power density Water Diaphragms (structural) Elasticity Valves Combustion Fuels Density Engines Exhaust systems Design Pistons High pressure (physics) Diaphragms (mechanical devices) Slug flows Stiffness Incompressible fluids Inertia (mechanics) Sealing (process) Pneumatic systems Compressors Flow (dynamics) Friction Simulation Dynamics (mechanics) Resonance Combustion chambers
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in