Pipeline　micro-leakage　internal　detection　spherical　detector　is　a　new　type　of　pipeline　leakage　detection　method.　The　shape　of　the　pipeline　is　complex　and　diverse.　Different　pipeline　shapes　have　different　effects　on　the　movement　and　force　of　the　spherical　detector.　Therefore,　it　is　very　important　to　find　out　the　force　and　movement　of　the　spherical　detector　in　different　pipelines.　In　this　paper,　the　force　of　the　spherical　detector,　the　pressure　distribution　and　the　flow　field　are　studied　in　the　pipeline　with　different　inclination　angles　by　numerical　simulation.　It　is　found　that　the　flow　resistance　and　drag　coefficient　of　the　spherical　detector　will　increase　firstly　and　then　decrease,　but　the　lift　coefficient　will　increase　with　the　increasing　tilt　angle　of　the　pipeline.　The　resultant　moment　of　the　spherical　detector　subjected　to　the　flow　field　is　relatively　stable,　and　the　rolling　friction　moment　increases　with　the　increasing　tilt　angle.　Through　this　numerical　simulation,　the　force　of　the　spherical　detector　in　different　shapes　of　pipes　is　obtained,　which　provides　help　for　the　subsequent　design　of　the　spherical　detector.　©　2024　SPIE.