{"id":12119,"date":"2013-06-23T11:33:19","date_gmt":"2013-06-23T11:33:19","guid":{"rendered":"http:\/\/spaceteam.tuwien.ac.at\/?p=719"},"modified":"2013-06-23T11:33:19","modified_gmt":"2013-06-23T11:33:19","slug":"pitot-tube","status":"publish","type":"post","link":"https:\/\/wptest3.tust.at\/index.php\/2013\/06\/23\/pitot-tube\/","title":{"rendered":"Pitot Tube"},"content":{"rendered":"

One of our experiments this year on STR-03 is the fluid flow velocity $latex V$ measurement with a Pitot-Tube. The principle of this device is the pressure difference between the ambient pressure (static pressure $latex p_s$) and the dynamic pressure $latex p_t$ on the tip.
\nWe measure this gap with an differential pressure sensor (ASDXRRX0) which is connected via $latex \\mathrm{I^2C}$ to the flight measurement system (FMS).<\/p>\n

\"pitot-tube-png\"<\/a><\/p>\n

The formula to get the velocity is:
\n$latex V = \\sqrt{\\frac{2 (p_t – p_s)}{\\rho}}$<\/p>\n

The missing term – the density $latex \\rho$ – can be calculated with $latex \\rho =\\frac{p_s}{R_s T}$. $latex R_s=287.058~\\frac{J}{kg K}$ is the specific gas constant of air and $latex T$ is the absolute temperature.<\/p>\n

There are two assumptions with this method: the air is incompressible ( good assumption up to $latex 800km\/h$) and the air is dry (otherwise the density would also depend on air humidity).<\/p>\n

To safe our pitot tube from damage there is a linear servo actuator inside the top section of STR-03 which withdraw the tube in a safe position at descend.<\/p>\n","protected":false},"excerpt":{"rendered":"

One of our experiments this year on STR-03 is the fluid flow velocity $latex V$ measurement with a Pitot-Tube. The principle of this device is the pressure difference between the ambient pressure (static pressure $latex p_s$) and the dynamic pressure $latex p_t$ on the tip. We measure this gap with an differential pressure sensor (ASDXRRX0)… Read More »Pitot Tube<\/span><\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","_themeisle_gutenberg_block_has_review":false,"_ti_tpc_template_sync":false,"_ti_tpc_template_id":"","footnotes":""},"categories":[29],"tags":[41,43],"class_list":["post-12119","post","type-post","status-publish","format-standard","hentry","category-allgemein","tag-experiment","tag-str-03"],"_links":{"self":[{"href":"https:\/\/wptest3.tust.at\/index.php\/wp-json\/wp\/v2\/posts\/12119","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wptest3.tust.at\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wptest3.tust.at\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wptest3.tust.at\/index.php\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/wptest3.tust.at\/index.php\/wp-json\/wp\/v2\/comments?post=12119"}],"version-history":[{"count":0,"href":"https:\/\/wptest3.tust.at\/index.php\/wp-json\/wp\/v2\/posts\/12119\/revisions"}],"wp:attachment":[{"href":"https:\/\/wptest3.tust.at\/index.php\/wp-json\/wp\/v2\/media?parent=12119"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wptest3.tust.at\/index.php\/wp-json\/wp\/v2\/categories?post=12119"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wptest3.tust.at\/index.php\/wp-json\/wp\/v2\/tags?post=12119"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}