Experimental Investigation to Inform the Design and Development of a High-Speed Projectile (044617)

Project Status: Current



The development of a high-speed weapon system requires detailed experimental and numerical investigations to better understand the complex flow-field involving three-dimensionality, crossflow separation, shock-boundary layer interactions, fluid-structure interactions, and unsteady wake-plume interactions. Theoretical and analytical methods such as DATCOM and MISL3 are often used as preliminary prediction tools, but those often fall short for detailed analysis due to their limited applicability and level of accuracy. Over the last two decades, a large number of CFD tools based on both steady-state as well as time-accurate methods have been developed to obtain aerodynamic coefficients. However, most of these CFD tools cannot accurately predict flows involving 3D crossflow separation, shock-boundary layer interactions, and fluid-structure interactions and therefore require further refinement based on experimental results. A detailed experimental investigation is therefore needed to validate high-fidelity simulation tools and understand fundamental flow physics for the development of precision projectiles. Intellectual Merit: The research methodology will involve a systematic experimental investigation to examine the basic aerodynamic characteristics of the next-generation projectile configurations with control surfaces at high-speeds. The investigation will involve examining the effect of angle of incidence and roll orientation on the aerodynamic characteristics over a range of Mach and Reynolds numbers. Measurements will include forces and moments using a sixcomponent strain gage internal balance, shadowgraph, and oil flow visualizations. The tightly integrated numerical simulations carried out at Army Research Laboratory will help develop a physics-based model and guide the experimental parametric space. The data obtained using both experimental and numerical simulations will help build an aerodynamic model for flight dynamics and control. Broader Impacts: The proposed work will generate a high fidelity experimental database for CFD validation and result in a better understanding of projectile aerodynamics. This integrated study will significantly leverage the established expertise of the investigators, especially in the areas of experimental aerodynamics, high-fidelity numerical simulations, and flight dynamics and control, while taking advantage of the existing facilities at FAMU-FSU College of Engineering at the Florida State University. Consequently, the students engaged in this research and its outcomes will come from a unique, culturally diverse population. The results will be broadly disseminated through presentations at professional meetings, publications in journals, and through the investigators’ very active collaborations with scientists at defense research laboratories, especially those within the Army Research Laboratory.