Rocket Nozzle Adhesive

Graphite Rocket Nozzle

Figure 30. - Provisions for thermal expansion of throat insert. Pyrolytic graphite. - Pyrolytic graphite is a very-high-density (2.2 gm cm3), erosion-resistant, expensive form of graphite formed by the deposition of gaseous carbon on a substrate. This layer-by-layer deposition results in a highly anisotropic material that differs greatly from polycrystalline graphite. The properties in the direction perpendicular to the layers (commonly referred to as the c direction) differ significantly from...

Liner Materials

The liner material shall, within the weight, budget, and envelope constraints, control erosion within allowable limits. Graphite-cloth phenolic, carbon-cloth phenolic and carbon carbon materials should be considered first for the throat insert of nozzles with throat diameters above 15 in. and traded against the more-erosion-resistant throat inserts for smaller sizes. These materials should be considered for the blast tubes, throat approaches, and throat extensions (forward exit liners) in...

Movablenozzle Tvc System

Designs incorporating flexible-joint TVC shall provide for the special load transmission and reaction requirements of this type of TVC system and provide adequate thermal protection for the flexible joint. A folding elastomeric boot (fig. 35(a)) is sufficient thermal protection for the flexible-joint element if the expansion ratio at the boot is 10 or greater. If the expansion ratio is significantly less than 10, then it is recommended that the boot be supplemented with a protective cowl and...

Design Requirements And Constraints

Nozzle design requirements and constraints are imposed specifcally by contract, are specified by propulsion or vehicle system analysis, or are left to the discretion of the nozzle designer. Requirements from system analyses are, in part, based on estimated nozzle weight, performance, and envelope. An iterative process therefore is involved, and nozzle design parameters can be expected to change during a design effort. The nozzle designer is better prepared to respond to changes when he is...

List Of Figures

1 Illustration of basic nozzle configurations and nozzle nomenclature 4 2 Basic exit configurations 3 Typical configurations for a liquid injection system attached to nozzle 6 4 Basic configurations for flexible-joint nozzles 7 5 Three possible locations for splitline of a movable nozzle 9 6 Nozzle for orbital boost motor 11 7 Condor nozzle 8 Sidewinder 1C nozzle 9 Phoenix 10 Nozzle for apogee motor, HS-303A 11 Sparrow 12 Nozzle for BE-3A4 13 Nozzle for Extended-Range 14 Nozzle for main retro...

Structural Analysis

Relatively recent advancements in structural analytical techniques in conjunction with the electronic computer have provided means by which very detailed predictions of the structural behavior and integrity of complex nozzle components can be made. In general, there are three major areas of concern in a typical solid rocket motor nozzle 1 The stress distributions in the basic structural shell of the nozzle induced primarily by internal pressure, ejection blowout , TVC side loads, and...

Throat Insert

Segmented Grains Rocket

Six groups of materials have been evaluated as nozzle throat inserts 3 Pyrolytic graphite and pyrolytic graphite codeposited with silicon carbide The first four materials are in common usage, and the carbon carbon composites also called fibrous graphites or prepyrolyzed composites are in advanced development. The ceramics, however, have poor thermal-shock characteristics currently they are not considered by nozzle designers to be suitable for solid rocket application. Only the first five...

Adhesives Sealants And Seals

Thrust Vector Control Nozzle Rocket

Adhesives are materials applied between components to bond the components together structurally. Sealants are liquid-solid mixtures installed between components to prevent gas flow. Seals are shaped materials e.g., O-rings installed between components to prevent gas flow. In most nozzle designs, epoxy adhesive is used for both adhesive and sealant functions. Epoxy adhesives that cure at room temperature are most common however, adhesives that cure at elevated temperatures are used for some...

Experimental Thermal Analysis

Nozzle firing tests, usually instrumented as discussed in reference 120, are often performed to verify a design and to provide material characteristics and property data for use in analytical prediction. Full-scale tests are always preferable to subscale tests, since possible inaccuracies in scaling data are precluded however, the cost of full-scale tests may be prohibitive. Subscale tests to acquire the data at less expense are often suggested however, very critical examination of the costs...

Nozzle Quality Assurance

Nozzle quality is assured by good process controls, nondestructive testing, destructive sample testing of components, and leak testing of the nozzle assembly. In addition, movable nozzles are vectored while pressurized. Nondestructive testing such as X-ray, alcohol wipe, ultrasonic, dye penetrant, and hardness testing generally is performed on all components. Reinforced-plastic composites usually are subjected to X-ray tangential and alcohol wipe no cracks are allowed, and delaminations and...

Basic Nozzle Structure

The basic structure of both external and submerged nozzles fig. 1 is subjected to internal pressure loads and flight loads. The internal pressure load is divided into an axial ejection blowout load and an opposing axial thrust load the flight loads include aerodynamic loads, inertial loads, and vibration loads. In addition to these loads, the submerged structure of a submerged nozzle is subjected to chamber pressure loads. If the nozzle is used with an attached TVC system, the nozzle structure...

Nozzletochamber Attachment

Four methods for attaching the nozzle to the chamber are in common use for flightweight production design fig. 36 . A bolted joint is most common because it is positive and rigid, provides means for accurate thrust alignment, disassembles freely, and is not size limited. Entrance thermal liner and insulation carbon phenolic tape Entrance thermal liner and insulation carbon phenolic tape a Boot alone boot folds as nozzle pivots Attach insulation ____ silica phenolic tape a Boot alone boot folds...

Nozzle Configuration And Construction

Classification Research

Nozzle design is a dynamic, iterative process, as evidenced by the estimate of nozzle designers that they average three major iterations before release of a design. Interation occurs because of 1 interactions between nozzle and total propulsion systems and 2 interactions between the design and analysis tasks fig. 22 . The initial values of the design parameters e.g., throat area, expansion ratio for the design of the nozzle are based on estimates of the weight, peformance, envelope, and...

Pu Ap Aerojet General Solid Propellent

Solid Rocket Motor Nozzles Pdf

The state of the art of solid rocket motor nozzle design is such that a successful design for a given set of requirements can, in general, be accomplished without first solving problems experimentally. Experimentation is necessary only when unusually severe requirements exceed the state of the art, when new materials must be proven, or when extremely tight flightweight margins of safety must be achieved. Figure 1 presents the two basic nozzle configurations and illustrates basic nozzle...

Spacecraft Contamination From Propulsion Systems Afrpl Tr-84-068

Evolution of Omniaxial Movable Nozzle Thrust Vector Control Systems U . Paper presented at 3d ICRPG AIAA Solid Propulsion Conference Atlantic City, NJ , June 4-6, 1968, CPIA Publ. 167, vol. I, April 1968, pp. 257-293. CONFIDENTIAL 2. Anon. Solid Rocket Motor Thrust Vector Control. NASA Space Vehicle Design Criteria Monograph, NASA SP-8114, December 1974. 3. Anon. Final Test Results, First Stage MINUTEMAN Marquardt Corporation TVC Nozzle MA-103-XDA Using the...