The NASA High-Speed Turboprop Program

Dugan, James; Miller, Brent A.; Graber, E. J.; Sagerser, D. A.

doi:10.4271/801120

Cited by 22 publications

(4 citation statements)

References 7 publications

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“…The potential is, however, independent of f/J, meaning this integration merely gives a factor of 21T, which is left out below. One-half of the total flux is directed outwards and given by (8) where (u rc > p is the velocity through the transition state surface averaged over all momenta leading to separation of the reactants. Notice that (urc)p depends on R. The integration limits are chosen such that (9) Equation (8) gives the flux through each point on the transition state surface under consideration.…”

Section: Complex Decompositionmentioning

confidence: 99%

Angular momentum conserving statistical method for rate constant calculations. Application to N+(3P)+H2(1Σ+g) →NH+(2Π)+H(2S)

Nyman¹

1992

The Journal of Chemical Physics

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Articles you may be interested inRole of the HNO3↔NOH Isomerization in reactions (i) NH(3Σ−)+O(3 P) and (ii) N(4 S)+OH(2Π): Ab initio calculations and quantum statistical Rice-Ramsperger-Kassel analysis of the potential energy surfaces A threedimensional potential energy surface for the reaction N+(3 P)+H2(1Σ+ g ) NH+ (X 2Π)+H(2 S) A lowenergy quasiclassical trajectory study of O(3 P)+OH(2Π)→O2(3Σ− g )+H(2 S). II. Rate constants and recrossing, zeropoint energy effects A distorted wave calculation for electronic energy transfer in molecular collisions. Application to the N2(A 3Σ u +)+CO(X 1Σ+) →N2(X 1Σ g +) +CO(a 3Π) system A quasiclassical Monte Carlo simulation procedure for calculating bimolecular rate constants is presented and applied to the reaction N+ ep) + H 2 ( II +) -+NH+ ell) + HeS). Effective potential theory is used to generate a spherically symmetric potential energy surface from an ab initio. based global potential energy surface due to Wilhelmsson and Nyman. A complex is formed If the reactants can reach the strong coupling region. Based on the available phase space, a microcanonical procedure conserving total angular momentum is used to determine into which channel the complex decomposes. Complex formation cross sections, branching ratios, and reaction cross sections are presented. Good agreement with previous trajectory calculations is found.

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Section: Complex Decompositionmentioning

confidence: 99%

Angular momentum conserving statistical method for rate constant calculations. Application to N+(3P)+H2(1Σ+g) →NH+(2Π)+H(2S)

Nyman¹

1992

The Journal of Chemical Physics

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“…1 ' 4 A majority of the research effort in this area has been aimed at the advanced high-speed turboprop aircraft wherein the direct airborne propeller-generated noise is quite intense and appears to be most critical for the success of this new generation aircraft. 5 Continued efforts to develop lightweight sidewall treatments are presently being pursued 6 and, coupled with the development of improved high-speed, lownoise propeller designs, 7 the direct airborne sidewall transmission problem may well be resolved in the near future. However, the potential for other sources and transmission paths governing the interior noise levels is quite high, based on most recent discoveries and historical data.…”

Section: Introductionmentioning

confidence: 99%

Detection of in-flight propeller-induced structure-borne noise

Unruh

1987

Journal of Aircraft

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A potentially important source of structure-borne interior noise transmission in advanced turboprop aircraft is the impingement of the propeller wake/vortex on downstream aerodynamic surfaces. It can be safely assumed that this potential source of interior noise may well adversely affect achievable interior noise levels unless noise control measures are conscientiously incorporated into the aircraft design. Through the use of a laboratorybased test apparatus, techniques were developed to estimate the level of in-flight structure-borne noise transmission from combined frequency response function ground testing and in-flight structural response measurements. All phases of the procedure were simulated in the laboratory and the expected level of accuracy of the procedure is addressed.

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“…p a t h hy method (1) would b e b y d e t a c h i n q t h e f u s el a q e from t h e winqs of a N o r t h American Rockwell OV-10 Bronco, shown i n F i g . 9, b y removinq t h e f o u r attachment b o l t s l e a v i n q t h e powerplants, winqs, and t a i l empennaqe u n d i s t u r b e d .…”

Section: T Can B E Used T O Demonstrate T H a T T H E S T R U C T Umentioning

confidence: 99%

Structureborne noise control in advanced turboprop aircraft

Loeffler

1987

25th AIAA Aerospace Sciences Meeting

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The NASA High-Speed Turboprop Program

Cited by 22 publications

References 7 publications

Angular momentum conserving statistical method for rate constant calculations. Application to N+(3P)+H2(1Σ+g) →NH+(2Π)+H(2S)

Angular momentum conserving statistical method for rate constant calculations. Application to N+(3P)+H2(1Σ+g) →NH+(2Π)+H(2S)

Detection of in-flight propeller-induced structure-borne noise

Structureborne noise control in advanced turboprop aircraft

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