Computation of Stability Derivatives of an oscillating cone for specific heat ratio = 1.66

International Conference on Aerospace and Mechanical Engineering 2017

航空航天工程;机械制造

Shabana, Aysha^1,2 ; Monis, Renita Sharon^1,3 ; Crasta, Asha^1 ; Khan, S.A.^4

Department of Mathematics, M.I.T.E, Moodabidri, Kazakhstan^1

Sahyadri College of Engineering and Management, Mangaluru, Karnataka, India^2

SMVITM, Bantakal

Karnataka, India^3

Department of Mechanical Engineering, Faculty of Engineering, IIUM, AGombak Campus, Kuala Lumpur, Malaysia^4

关键词: Axisymmetric;    Closed form;    Semicone angle;    Specific heat ratio;    Stability derivatives;    Stiffness and damping;    Vertex angle;    Viscous effect;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/370/1/012059/pdf
DOI  :  10.1088/1757-899X/370/1/012059

学科分类：航空航天科学

来源: IOP

【 摘 要 】

In this paper the expressions for stiffness and Damping derivatives are obtained in a closed form for perfect gas where the flow is quasi-steady and axi-axisymmetric, and the nose semi angle of the cone is such that the Mach number M2behind the shock M2≥ 2.5. Results are presented for an oscillating cone for gas with = 1.666, at different Mach numbers and semi cone angles. The Stiffness derivative decreases with pivot position and also with semi vertex angle, there is substantial change in the stiffness derivative when semi-vertex has been increased from 5 degrees to ten degrees, further increase in the semi-vertex angle results in marginal change in the stiffness derivative. Due the marginal change in the Mach number level there is marginal increase in the magnitude of the stability and with further increase in the inertia level the stability derivative conform to the Mach number independence principle. The present theory for Oscillating cone is restricted to quasi-steady case. Viscous effects have been neglected. The expressions so obtained for stability derivative in pitch are valid for a slender ogive which often approximates to the whole fuselage of an aircraft.