Form 9.B Project Summary
Chron:
971396
Proposal Number:
07.04-6100
Project Title:
Large-Scale Performance
Improvements of RBCC Engines Using
the Dynamic Ejector
Technical Abstract (Limit 200 words)
A unique and innovative approach to significantly
increasing the thrust performance of
ejector-configured, rocket-based combined-cycle
(RBCC) engines is proposed. The approach
involves oscillating (switching) the rocket exhaust
at high frequency (the dynamic ejector), rather than
permitting it to simply flow coaxially with the
induced air as in a conventional ejector
configuration. Since the sole mechanism for
transferring momentum and energy between the
two streams in a conventional ejector is viscous
shear through turbulent jet mixing, very large
losses result. This leads to lower thrust levels
(hence, specific impulse) than those achievable
using a more efficient method of momentum and
energy exchange. It is shown herein that oscillation
of the rocket exhaust using secondary fluid
injection (as in thrust vector control techniques)
results in a far more efficient transfer of momentum
and energy, leading to very significant increases in
specific impulse, probably in excess of 50% thrust
augmentation. The proposed concept is responsive
to the solicitation's subtopic calling for "high thrust
performance of ejector-ramjets...at take-off of the
hypersonic vehicle..." Indeed, the performance
benefits derived from the proposed concept occur
principally at take-off.
Potential Commercial Applications (Limit 200 words)
Ejector ram/scramjets will be found to be a cost
effective, high performance propulsion system
technology in the near future. The participants in
NASA's ARTT program have already committed to
this technology. We will seek to move the
technology developed in Phases I and II into
prototype and full-scale engine development in
Phase III, with application to three market sectors:
the military, civil and commercial marketplaces,
both domestic and foreign. The Phase III objectives
will be to continue the process of evolving the
integrated, dynamic ejector-based, RBCC ejector
ram/scramjet, and further reducing the technology
risk through system demonstration at the
prototype, then full-scale level. The reduction of
technical risk is a required precursor to the
reduction of business risk. This, then, is a precursor
to positive investment decisions.
Name and Address of Principal Investigator (Name,
Organization Name, Mail Address, City/State/Zip)
Wallace Chinitz
GASL, Inc.
77 Raynor Avenue
Ronkonkoma , NY 11747-6648
Name and Address of Offeror (Firm Name, Mail Address,
City/State/Zip)
John I. Erdos
GASL, Inc.
77 Raynor Avenue
Ronkonkoma , NY 11747-6648