The nuclear thermal rocket (NTR) is a proven, high thrust propulsion technology that has twice the specific impulse (Isp ~900 s) of today’s best chemical rockets. During the Rover and NERVA (Nuclear Engine for Rocket Vehicle Applications) programs, twenty rocket reactors were designed, built and ground tested. These tests demonstrated: (1) a wide range of thrust; (2) high temperature carbide-ba...

This paper is a summary overview of a study conducted at the NASA Marshall Space Flight Center (NASAMSFC) during the initial phases of the Space Launch Initiative (SLI) program to evaluate a large number of technical problems associated with the design, development, test, evaluation and operation of several major liquid propellant rocket engine systems (i.e., SSME, Fastrac, J-2, F-I). One of th...

A key requirement of a low-gravity screen-channel liquid acquisition device (LAD) is the need to retain 100% liquid in the channel in response to propellant outflow and spacecraft maneuvers. The point at which a screen-channel LAD ingests vapor is known as breakdown, and can be measured several different ways such as: visual observation of bubbles in the LAD channel outflow; a sudden change in ...

Calculations of the centrifugal machines critical frequencies rotors are currently carried out on basis finite element method using multi-functional software as same ANSYS and other similar, that work with elements three-dimensional type, well some specialized computer programs working beam-type elements. Anyway, is used. But in this case an user needs a lot time for prepation initial data. The...

The paper presents a method for determining the frictional moments of oscillation groups most widespread domestically made liquid propellant engine steering units. This is topical issue requiring investigation to improve efficiency and reliability groups. reason occurrence an additional axial force in radial bearings articulated joints that leads overestimation actual values relative theoretica...

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