Toolbox 75028

Input

Groove geometry definitions

Summary

ESDU 75028 is derived from a correlation of experimental data that enable the drag increment to be predicted due to a groove of planform aspect ratio greater than 8 normal to the flow. For grooves inclined at angles to the flow exceeding 60 degrees the data for the grooves normal to the flow apply, while for grooves inclined between 0 degrees (parallel to the flow) and 60 degrees a method for obtaining the maximum increment is suggested based on the use of ESDU 75031 to predict the increments due to the forward- and rearward-facing steps together with an appropriate skin friction allowance.

ESDU 73017 and 77021 provide atmospheric data, if required. These Items are complemented by a Toolbox App.

ESDU 68020 provides data for a turbulent boundary layer on a flat plate, if required. Estimates for local and mean skin friction coefficients may be obtained from the Toolbox App.

General

Flow conditions at edge of boundary layer

Groove Excrescence

Forward end

Aft end

Surface

Results : Warning - the input has changed! Rerun the calculation contain errors or warnings

Save results as

Partial results are given below.

General

{{tba.os.CD.title}},	{{occ.oodleCore.utils.valPrintFixed(tba.os.CD.value, 6)}}
{{tba.os.planform_area.title}},	{{occ.oodleCore.utils.valPrintFormatted(tba.os.planform_area.value)}}
{{tba.os.Rh.title}},	{{occ.oodleCore.utils.valPrint(tba.os.Rh.value)}}
{{tba.os.l_over_h.title}},	{{occ.oodleCore.utils.valPrint(tba.os.l_over_h.value)}}

Results for groove aligned with flow (β = 0)

Groove forward end:

{{tba.os.aligned_with_flow.ends.forward.P.title}},	{{occ.oodleCore.utils.valPrintFixed(tba.os.aligned_with_flow.ends.forward.P.value, 4)}}
{{tba.os.aligned_with_flow.ends.forward.Q.title}},	{{occ.oodleCore.utils.valPrintFixed(tba.os.aligned_with_flow.ends.forward.Q.value, 4)}}
{{tba.os.aligned_with_flow.ends.forward.Cd.title}},	{{occ.oodleCore.utils.valPrintFixed(tba.os.aligned_with_flow.ends.forward.Cd.value, 6)}}

Groove aft end:

{{tba.os.aligned_with_flow.ends.aft.P.title}},	{{occ.oodleCore.utils.valPrintFixed(tba.os.aligned_with_flow.ends.aft.P.value, 4)}}
{{tba.os.aligned_with_flow.ends.aft.Q.title}},	{{occ.oodleCore.utils.valPrintFixed(tba.os.aligned_with_flow.ends.aft.Q.value, 4)}}
{{tba.os.aligned_with_flow.ends.aft.Cd.title}},	{{occ.oodleCore.utils.valPrintFixed(tba.os.aligned_with_flow.ends.aft.Cd.value, 6)}}

Groove sidewalls:

,	{{occ.oodleCore.utils.valPrintFixed(tba.os.aligned_with_flow.groove.CDSF.value, 6)}}

Groove forward end, aft end and sidewalls:

{{tba.os.aligned_with_flow.groove.CD0.title}},	{{occ.oodleCore.utils.valPrintFixed(tba.os.aligned_with_flow.groove.CD0.value, 6)}}
{{tba.os.aligned_with_flow.groove.F.title}},	{{occ.oodleCore.utils.valPrint(tba.os.aligned_with_flow.groove.F.value)}}

Results for groove normal to flow (β = 90°)

{{tba.os.normal_to_flow.Phi.title}},	{{occ.oodleCore.utils.valPrintFixed(tba.os.normal_to_flow.Phi.value, 4)}}
{{tba.os.normal_to_flow.Psi.title}},	{{occ.oodleCore.utils.valPrintFixed(tba.os.normal_to_flow.Psi.value, 4)}}
{{tba.os.normal_to_flow.Cda.title}},	{{occ.oodleCore.utils.valPrintFixed(tba.os.normal_to_flow.Cda.value, 6)}}

DEBUG

tba:

{{tba | json}}