In　fluid　machinery,　the　concurrent　presence　of　cavitation　bubbles　and　particle　clusters　leads　to　considerably　damage　to　material　surfaces.　This　study　investigates　the　dynamics　of　a　bubble　situated　among　triple　particles　based　on　the　Kelvin　impulse　model　and　high-frame-rate　photography,　focusing　on　the　impact　of　the　dimensionless　distance　of　particles　and　the　bubble　size.　Specifically,　the　jet,　bubble　motion,　and　bubble　interface　evolution　characteristics　are　quantitatively　evaluated.　The　following　conclusions　are　obtained:　(1)　The　collapse　shapes　of　the　bubble　can　be　divided　into　three　typical　cases:　equilateral　triangle　shape,　isosceles　triangle　shape,　and　arcuate　shape.　(2)　Among　the　triple　particles,　four　zero-Kelvin-impulse　locations　are　present,　around　which　the　jet　direction　is　extremely　sensitive　to　the　bubble　initial　position.　As　the　bubble　initial　position　moves　along　the　central　line,　the　bubble　motion　direction　dramatically　changes　during　its　collapse.　(3)　The　relative　position　of　bubble　and　particles　is　the　key　parameter　that　affects　the　bubble　dynamics.　As　the　bubble-particle　distance　decreases,　the　non-uniformity　of　bubble　collapse　morphology　and　the　bubble　motion　distance　will　become　more　significant.　©　2024　Author(s).