The purpose ofthe sω dy is experimental ; y investig 飢 ing effects ofthe now behavior and 翰 e flow resistance that the acce 【 eration and the inlet shape cxcrted . T} 1e exp3riments were perfbrmed under ranges ftem rest to Reynolds number Re = 4× 10-w 詫h two kinds of acceleration 跏 d two k三 nds of inlet shape . lhe flow behavior and wall shear stress a【e measured by the thr hot wire type probc and surf … Lce probe in test section . The unstcady flow maint 組ns thc laminar over the crit{cal Reynoids number in steady state ( R σ = 2300 ) , and thcn the time oftransition to turbulent delaying f} om the inlct to downstrcam , [ [ his ls caused by flow ratc increases without disturbance in the accelerating 月ow , turbulence generated at the inlet convect { on to downstream by the mainstream . ' M]erefore , its transition time in inlet region is decidcd by time when turbulence is generated near an inlct
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