Abstract
Sampling probes with orifice sizes ranging from 75 to 2000 μm have been examined analytically and experimentally. Design considerations for probes that quench chemical reactions “aerodynamically” were evaluated in detail. Mass flow rates and axial static pressure distributions were determined in experiments and compared with model predictions. Both the experimental determinations and the theoretical calculations indicate that microprobes (orifice diameters of ∼75 μm) cannot quench gases aerodynamically. For properly designed macroprobes (orifice diameters of ∼2000 μm) operated at design conditions, calculations indicate that an aerodynamic quench is achievable. Static pressures measured within a macroprobe were in excellent agreement with calculated values.
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