Preliminary Engineering Design of Multiple Shattered Pellet Injector for HL-3
A multiple shattered pellet injector(multi-SPI)is proposed to perform mitigation research on HL-3.Based on the HL-3 design scenarios and physical requirements,preliminary engineering design of the multi-SPI is introduced.In this work,the basic parameters of pellet are designed,and the modes of pellet launch and impact are selected.Combined with en-gineering design and system layout of the multi-SPI,including gas supply,pellet preparation,vacuum,and double-impact tube sub-systems,the design scheme is verified by thermodynamic analysis.In-situ condensation and pneumatic acceleration technologies are adopted for the multi-SPI.It can prepare and inject 3 pellets at a time,one pellet is Φ7 mm and the others are Φ5.5 mm,and all pellets have a diameter-length ratio of about 1.3,with the design velocities within 200 to 300 m/s.
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