Close-up analysis of aircraft ice accretion

Hansman, R. John; Breuer, Kenneth; Hazan, Didier; Reehorst, Andrew L.; Vargas, Mario

doi:10.2514/6.1993-29

Cited by 26 publications

(31 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For this purpose, tests should be made at temperatures cold enough to result in fully rime ice. With β 0 determined from equation (8) and the stagnation ice thickness measured from the experimental accretion, equation (10) Given a set of reference conditions and choosing scale model size, Ruff used these parameters plus φ and θ from equations (26) and (27) to provide five equations to solve for scale temperature, pressure, drop MVD, cloud LWC and spray duration. All of these earlier methods, including Ruff's, left the arbitrary choice of scale velocity to the user.…”

Section: Validation Of the Freezing Fraction Expressionmentioning

confidence: 99%

“…Olsen and Walker 24 and Hansman, et al, 25,26,27 studied surface effects and surface water during ice accretion, presenting additional evidence that these were important phenomena to consider in ice accretion. From close-up photographic studies, it was observed that for glaze ice accretion unfrozen water on the ice surface tended to coalesce to form beads.…”

Section: Validation Of the Freezing Fraction Expressionmentioning

confidence: 99%

See 1 more Smart Citation

Overview of Icing Physics Relevant to Scaling

Anderson¹,

Tsao²

2003

SAE Technical Paper Series

View full text Add to dashboard Cite

Section: Validation Of the Freezing Fraction Expressionmentioning

confidence: 99%

Section: Validation Of the Freezing Fraction Expressionmentioning

confidence: 99%

Overview of Icing Physics Relevant to Scaling

Anderson¹,

Tsao²

2003

SAE Technical Paper Series

View full text Add to dashboard Cite

“…Figure 5 shows the growth rates of each feather versus their water mass flux, which is defmed as the freestream velocity times the LWC (Ref. 10), and the linear fit of this data. Figure 6 shows the flight data and its fit, and the IRT data (Ref.…”

Section: Feather Growth Rate Comparison To Irt Datamentioning

confidence: 99%

Close-up analysis of inflight ice accretion

Reehorst

Ratvasky

Sims³

1994

32nd Aerospace Sciences Meeting and Exhibit

Self Cite

View full text Add to dashboard Cite

The objective of this effort was to validate in flight, data that has been gathered in the NASA Lewis Research Center' s Icing Research Tunnel (IRT) over the past several years. All data was acquired in flight on the NASA Lewis Research Center' s Twin Otter Icing Research Aircraft. A faired 3.5 in. diameter metal-clad cylinder exposed to the natural icing environment was observed by a close-up video camera The grazing angle video footage was recorded to S-VHS video tape and after the icing encounter, the resultant ice shape was documented by 35 mID photography and pencil tracings . The feather growth area was of primary interest; however, all regions of the ice accretion, from the stagnation line to the aft edge of runback were observed and recorded. After analysis of the recorded data several interesting points became evident: (1) The measured flight feather growth rate is consistent with IRT values, (2) The feather growth rate appears to be influenced by droplet size, (3) The feathers were straighter in the lower, spottier L WC of flight in comparison to those observed in the IRT, (4) Feather shedding and ice sublimation may be significant to the final ice shape, (5) The snow encountered on these flights appeared to have little influence on ice growth.

show abstract

“…Recent close-up video studies have observed ice growth from upstream face of surface protuberances [2]. This process is thought to be initiated by local enhancement in heat transfer which occurs on surface roughness which are approximately one mm in diameter.…”

Section: Introductionmentioning

confidence: 99%

Study of heat transfer enhancement on surface protuberances using infrared technique

Henry¹,

Hansman²,

Balageas³

1994

Proceedings of the 1994 International Conference on Quantitative InfraRed Thermography

View full text Add to dashboard Cite

In order to determine the effect of ice protuberances on local convective heat transfer coefficient, enhancement of heat transfer coefficient on small (2 mm to 6 mm diameter) hemispherical elements on a flat plate has been studied in a wind tunnel using an infrared camera. The influence of size and density of protuberances and velocity are investigated for laminar and turbulent boundary layers on the flat plate. Maximum heat transfer is observed on the upstream face of protuberances and values increase strongly with roughness size and velocity for laminar conditions on the flat plate. For turbulent conditions. heat transfer enhancement is relatively constant with velOCity. but increases with the size of protuberances. Results are also given for multiple elements configurations.

show abstract

Close-up analysis of aircraft ice accretion

Cited by 26 publications

References 1 publication

Overview of Icing Physics Relevant to Scaling

Overview of Icing Physics Relevant to Scaling

Close-up analysis of inflight ice accretion

Study of heat transfer enhancement on surface protuberances using infrared technique

Contact Info

Product

Resources

About