Multiple Impact Jet Apparatus (MIJA): Application To Rain Erosion Studies

P. N. H. Davies; J. E. Field

doi:10.1117/12.960790

11 September 1989 Multiple Impact Jet Apparatus (MIJA): Application To Rain Erosion Studies

P. N. H. Davies, J. E. Field

Proceedings Volume 1112, Window and Dome Technologies and Materials; (1989) https://doi.org/10.1117/12.960790
Event: SPIE 1989 Technical Symposium on Aerospace Sensing, 1989, Orlando, FL, United States

Abstract

The advantages of jet methods over other forms of impact, for single impact studies, have been well documented. The recent development of a multiple jet impact apparatus (MIJA) at the Cavendish Laboratory now allows us to study multiple impact in a controlled way. Using the same nozzle design as the previous single impact devices, MIJA produces jets by pneumatically accelerating a titanium shaft into the rear water chamber of the nozzle. The shock-accelerated jets are of the high quality (spherically fronted, symmetrical and with a coherent core) necessary for simulating 2 to 10 mm diameter drop impact. Impact velocities in the range up to ca. 250 m s-1 have been achieved. A major advantage of the equipment is that the velocity and position of impact of each jet can be controlled and repetition rates of ~10 min-1 can be maintained for extended periods of time. Computer control is used to ensure that the chosen impact velocity is maintained; to control the specimen position (single site or linear and random arrays are possible) and to maintain an accurate impact record. The first part of the paper describes the design, construction and performance of MIJA. The final sections present experimental data, for a range of "window" materials, on threshold velocities and damage development.

Citation Download Citation

P. N. H. Davies and J. E. Field "Multiple Impact Jet Apparatus (MIJA): Application To Rain Erosion Studies", Proc. SPIE 1112, Window and Dome Technologies and Materials, (11 September 1989); https://doi.org/10.1117/12.960790

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